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Q:
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Increased steric hindrance enhances the rate of SN1 reactions versus SN2 reactions because |
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A
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it is more difficult for the nucleophile to attack a sterically-hindered molecule. |
B
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steric hindrance increases reactivity which makes SN1 reactions more likely. |
C
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steric hindrance protects the nucleophile from reacting with the solvent. |
D
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nucleophilic attack of sterically-hindered molecules is easier than non-sterically-hindered molecules. |
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Tags:
Organic Chemistry Reactions | Molecular Structure | |
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| 3 |
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Q:
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Hydroformylation involves the addition of a formaldehyde (formyl groupe) onto alkenes. For a hydroformylation process with propene that follows Markovnikov addition using a carbocation intermediate, which product will be favored? |
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A
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butanal |
B
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2-methylpropanal |
C
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2-methylbutanal |
D
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propanal |
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Tags:
Organic Chemistry Reactions | Molecular Structure | |
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| 4 |
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Q:
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The reaction below depicts a 1,2-hydride shift which is a reaction that heavily favors the products.
The reason for strongly favoring the products is:
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A
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the primary cabocation is more charged than the secondary carbocation and pulls the hydrogen atom toward itself |
B
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the hydride shift favors a secondary carbocation rather than a primary carbocation |
C
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methyl groups are more electronegative and pull positive charges toward themselves |
D
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the secondary carbocation is less stericaly hindered than the primary carbocation |
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Tags:
Organic Chemistry Reactions | Molecular Structure | |
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| 5 |
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Q:
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Upon oxidation with excess reagents, which of the following choices best describes the resultant molecule in terms of carboxylic acid and ketone sites present?
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A
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One carboxylic acid, two ketones |
B
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Three ketones |
C
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Two carboxylic acids |
D
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One carboxylic acid, one ketone |
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Tags:
Carboxylic Acids | Organic Chemistry Reactions | |
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| 7 |
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Q:
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In each molecule below, a carbocation is formed when the alcohol group is removed. Which of the following best describes the stabilities of the carbocations?
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A
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The carbocation of Alcohol A is more stable than the carbocation of Alcohol B since it lacks a methoxy group, which would destabilize the carbocation
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B
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The carbocation of Alcohol A is less stable than the carbocation of Alcohol B since it lacks a methoxy group, which would destabilize the carbocation
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C
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The carbocation of Alcohol B is more stable than the carbocation of Alcohol A since it has a methoxy group, which would stabilize the carbocation
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D
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The carbocation of Alcohol B is less stable than the carbocation of Alcohol A since it has a methoxy group, which would stabilize the carbocation
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Tags:
Molecular Structure | Organic Chemistry Reactions | |
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| 9 |
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Q:
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In the following reaction, the fastest reaction rate occurs in pure water, as opposed to occurring in a solvent like ethanol. Which of the following best describes why this scenario takes place?
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A
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The aromatic rings in both reactants are hydrophobic and will be in close proximity to each other, which increases the chance of a reaction taking place
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B
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The aromatic rings in both reactants are hydrophobic and will be in close proximity to each other, which decreases the chance of a reaction taking place
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C
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The aromatic rings in both reactants are hydrophilic and will be in close proximity to each other, which increases the chance of a reaction taking place
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D
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The aromatic rings in both reactants are hydrophilic and will be in close proximity to each other, which decreases the chance of a reaction taking place
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Tags:
Carboxylic Acids | Molecular Structure | Organic Chemistry Reactions | |
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| 10 |
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Q:
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An allylic substitution reaction results in two regioisomeric monobromides, as shown below. Which of the following statements about their relative stabilities is correct?
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A
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Molecule A is more stable because it has a more sterically hindered bromine.
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B
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Molecule A is more stable because it has conjugated double bonds.
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C
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Molecule B is more stable because it has a less sterically hindered bromine.
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D
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Molecule B is more stable because it has conjugated double bonds.
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Tags:
Molecular Bonding | Molecular Structure | Organic Chemistry Reactions | |
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| 11 |
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Q:
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The nitrogen-containing reactant below (Reactant B) can act as a nucleophile in certain reactions. The reaction below is carried out in a pH = 4.5 buffer. This is because the pKa of the protonated carbonyl (Reactant A) is between -2 and -8, so there is a low concentration of this highly reactive electrophile at a pH of 4.5. If the pH is further lowered (from 4.5) in order to try and increase the concentration of this electrophile, which of the following correctly describes the likely counter-effect?
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A
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Increasing the acidity would cause less of Reactant B to become protonated (decreasing its nucleophilicity), and this would counteract the increase in electrophilicity of Reactant A.
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B
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Increasing the acidity would cause more of Reactant B to become protonated (decreasing its nucleophilicity), and this would counteract the increase in electrophilicity of Reactant A.
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C
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Increasing the acidity would cause more of Reactant B to become protonated and this would have no effect on the electrophilicity of Reactant A.
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D
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Increasing the acidity would have no effect on Reactant B and no effect on the electrophilicity of Reactant A.
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Tags:
Acid/Base Equilibria | Miscellaneous Organic Chemistry | Organic Chemistry Reactions | Molecular Structure | |
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| 12 |
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Q:
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Given the molecule below, which of the following is TRUE regarding its ability (or inability) to undergo an acylation reaction?
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A
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The molecule will undergo an intramolecular acylation reaction between the wedged alcohol and the carboxylic acid
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B
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The molecule will undergo an intramolecular acylation reaction between the dashed alcohol and the carboxylic acid
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C
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The molecule will NOT undergo an intramolecular acylation reaction because the double bond does not allow for the interaction between the alcohols and the carboxylic acid
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D
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The molecule will NOT undergo an intramolecular acylation reaction because acylation reactions cannot occur with carboxylic acids.
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Tags:
Carboxylic Acids | Organic Chemistry Reactions | Molecular Structure | Alcohols | |
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| 13 |
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Q:
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SN1 reactions are not stereospecific because: |
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A
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they involve a carbocation intermediate which can react to form one of two stereoisomers. |
B
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they are attacked by strong nucelophiles. |
C
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they have weak leaving groups. |
D
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they require an ionic environment for stabilization. |
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Tags:
Organic Chemistry Reactions | |
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| 15 |
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Q:
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Otherwise lipid-soluble steroid molecules can be made water-soluble by which of the following modifications? |
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A
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reducing alcohol groups |
B
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adding carboxylic acid groups |
C
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oxidizing hydrogen atoms to alcohol groups |
D
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decarboxylation |
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Tags:
Organic Chemistry Reactions | |
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| 16 |
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Q:
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How does the oxidation state of carbon change when an alcohol is oxidized to an aldehyde? |
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A
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The oxidation state increases by 2. |
B
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The oxidation state decreases by 2. |
C
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The oxidation state increases by 1. |
D
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The oxidation state decreases by 1. |
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Tags:
Redox Reactions | Organic Chemistry Reactions | |
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| 17 |
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Q:
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A nucleophilic reaction to a carbonyl is considered neither an SN1 nor SN2 reaction because: |
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A
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no substitution occurs during nucleophilic addition to a carbonyl. |
B
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the reaction proceeds through an E1 or E2 mechanism instead. |
C
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the solvent for the reaction is not aqueous. |
D
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the solvent for the reaction is not polar. |
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Tags:
Miscellaneous Organic Chemistry | Organic Chemistry Reactions | |
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| 18 |
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Q:
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A nucleophilic functional group may also be thought of as a: |
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A
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Lewis acid. |
B
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Lewis base. |
C
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Bronsted acid. |
D
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Bronsted base. |
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Tags:
Organic Chemistry Reactions | |
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| 19 |
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Q:
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The Tollens' test will yield a shiny silver mirror on the glass vial containing the reaction if what type of sugar is added? |
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A
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reducing sugar |
B
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non-reducing sugar |
C
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any disaccharide |
D
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any non-monosaccharide |
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Tags:
Carbohydrates | Organic Chemistry Reactions | |
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| 20 |
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Q:
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Which of the following is FALSE regarding SN1 reactions? |
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A
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The second step is rate limiting. |
B
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There are two steps in the reaction. |
C
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The rate limiting step involves the departure of a leaving group. |
D
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An intermediary carbocation is formed. |
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Tags:
Organic Chemistry Reactions | |
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| 21 |
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Q:
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Which of the following is a possible product of the reduction of an aldehyde? |
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A
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cyclohexanone |
B
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butanol |
C
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3-pentanol |
D
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butyraldehyde |
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Tags:
Organic Chemistry Reactions | |
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| 22 |
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Q:
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Ethanoyl chloride (CH3COCl) reacts with water to form a(n): |
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A
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carboxylic acid. |
B
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ester. |
C
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alcohol. |
D
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amide. |
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Tags:
Organic Chemistry Reactions | |
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| 23 |
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Q:
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Which of the following is accurate regarding SN1 reactions? |
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A
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They take place in a single step. |
B
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No nucleophilic attack is required. |
C
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Halides very rarely serve as leaving groups. |
D
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The reaction passes through a planar intermediate molecule. |
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Tags:
Organic Chemistry Reactions | |
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| 24 |
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Q:
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Various carbocations are produced in the laboratory with various groups attached to the carbon atom. Which of the following groups would yield least stable molecule? |
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A
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two ethyl groups and one methyl group |
B
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all hydrogen atoms |
C
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one ethyl group and two methyl groups |
D
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three phenyl groups |
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Tags:
Organic Chemistry Reactions | |
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| 25 |
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Q:
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An amide bond between amino acids can be formed via a: |
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A
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hydration reaction. |
B
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dehydration reaction. |
C
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decarboxylation reaction. |
D
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redox reaction. |
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Tags:
Organic Chemistry Reactions | |
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| 26 |
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Q:
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Strecker synthesis is used in the synthesis of: |
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A
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fats. |
B
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hydrocarbons. |
C
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nucleic acids. |
D
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amino acids. |
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Tags:
Organic Chemistry Reactions | |
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| 27 |
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Q:
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In organic reactions, hydrides are mostly utilized as: |
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A
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a stable R-group. |
B
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reducing agents. |
C
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largely inert. |
D
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a proton-acceptor. |
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Tags:
Organic Chemistry Reactions | |
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| 28 |
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Q:
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Which of the following holds true regarding tautomerization? |
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A
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tautomers are molecules which differ in one or more stereocenters |
B
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tautomers are defined as molecules differing in the placement of two or more atoms within a molecule |
C
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equilibrium between tautomers rarely favors a single tautomer |
D
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generally the keto form is more stable than the enol form in keto-enol tautomerization |
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Tags:
Aldehydes and Ketones | Organic Chemistry Reactions | |
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| 29 |
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Q:
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1,2-dimethylcyclopentene reacts with hydrochloric acid to form a compound. How many stereoisomers are created as products in this reaction? |
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Tags:
Organic Chemistry Reactions | |
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