MCAT Practice Quiz

MCAT © - Substitution Mechanisms

Question 1 of 5

Passage 1 (Questions 1‑5)

Figure 1

Figure 2

Question 1

The nucleophile in figure 1 can best be described as:

A. a strong acid B. a weak acid C. a weak base D. a strong base

Passage 1 (Questions 1‑5)

Figure 1

Figure 2

Question 2

Which of the following best describes the mechanism shown in Figure 1?

A. one-step concerted process B. two-step process with carbocation intermediate C. three-step process with multiple intermediates D. reversible equilibrium process

Passage 1 (Questions 1‑5)

Figure 1

Figure 2

Question 3

The rate law for an SN2 reaction would be:

A. Rate = k[substrate][nucleophile] B. Rate = k[substrate] C. Rate = k[nucleophile] D. Rate = k[substrate]²

Passage 1 (Questions 1‑5)

Figure 1

Figure 2

Question 4

What stereochemical outcome is expected for the reaction shown in figure 2?

A. retention of configuration B. racemization C. inversion of configuration D. no stereochemical change

Passage 1 (Questions 1‑5)

Figure 1

Figure 2

Question 5

Which solvent would most favor an SN1 reaction?

A. dimethyl sulfoxide (DMSO) B. acetone C. diethyl ether D. ethanol

Question 1 of 5