Question 1

Which element has the highest electronegativity according to the Pauling scale shown in the periodic table?

Accepted Answer

Fluorine ($$	ext{F})$$

Question 2

In the context of E2 vs. SN2 reactions, which factor most strongly favors E2 over SN2 for a secondary alkyl halide?

Accepted Answer

Use of a strong base in a polar aprotic solvent

Question 3

Which solvent would best stabilize the transition state for an SN2 reaction with sodium propoxide as the nucleophile?

Accepted Answer

Dimethyl sulfoxide (DMSO)

Question 4

Given the reaction coordinate diagrams (RCDs) X, Y, and Z, which diagram best represents a multi-step reaction mechanism?

Accepted Answer

RCD Z

Question 5

Which of the following statements best explains why elimination reactions are favored at higher temperatures?

Accepted Answer

Elimination reactions feature an increase in entropy which benefits from increased temperature.

Question 6

For the reaction shown in image 4, which substrate/reagent pairing would maximize ether formation?

Accepted Answer

A strong nucleophile and a primary alkyl halide in a polar aprotic solvent

Question 7

Which leaving group would result in the lowest energy transition state for a nucleophilic substitution reaction?

Accepted Answer

Tosylate ($$	ext{TsO}^-)$$

Question 8

In the periodic table shown, which element would be expected to form the strongest hydrogen bonds?

Accepted Answer

Fluorine ($$	ext{F})$$

Question 9

A student investigates the rate law for a reaction and finds that doubling the concentration of the electrophile doubles the rate, but doubling the concentration of water does not affect the rate. What is the most likely mechanism?

Accepted Answer

Unimolecular rate-determining step resulting in substitution ($$	ext{SN1})$$

Question 10

Which nucleophile would react fastest in DMSO as a solvent?

Accepted Answer

Fluoride ($$	ext{F}^-)$$

Question 11

In the context of the reaction coordinate diagrams, which reaction is most likely to have a significant decrease in entropy?

Accepted Answer

Reaction M

Question 12

Which description of the basic component in the reactions is correct? (M: Ether oxygen as Lewis base, N: NaSMe as Bronsted-Lowry base, O: H2O as Bronsted-Lowry base)

Accepted Answer

M and N

Question 13

Which reaction coordinate diagram matches a reaction with multiple mechanistic steps, such as a typical SN1 or E1 reaction?

Accepted Answer

RCD Z

Question 14

Which factor would most likely increase the rate of an SN2 reaction?

Accepted Answer

Increasing the concentration of both the nucleophile and the substrate

Question 15

Which of the following is a plausible reason why SN1 reactions are favored in polar protic solvents?

Accepted Answer

Polar protic solvents stabilize carbocation intermediates via solvation

Question 16

Which product is NOT possible when NaOH is used on a substrate with the leaving group on a wedge, considering minor products?

Accepted Answer

Product with retention of configuration

Question 17

Which of the following best describes the relationship between bond strength and atom size?

Accepted Answer

Bond strength decreases as atom size increases

Question 18

Which mechanism is enforced when a strong base is used on a cyclic structure, as shown in the short response section?

Accepted Answer

E2 mechanism

Question 19

Which of the following solvents is classified as polar aprotic?

Accepted Answer

Dimethyl sulfoxide (DMSO)

Question 20

Which group in the periodic table is most likely to contain elements that act as good leaving groups in organic reactions?

Accepted Answer

Halogens (Group 17)

Organic Chemistry Exam 3 Study Guidance: Acidity, Basicity, Mechanisms, and Reaction Analysis

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