The following can be said about the reaction profile of an S_N1 reaction:
I.The rate determining step is the formation of a carbocation.
II.The reaction profile has one transition state.
III.The slow step is the first transition state.
IV.The second step is attack of nuleophile on carbocation.
V.The reaction proceeds in a polar aprotic solvent.

Question

Quizplus · Accepted Answer

Statement I suggests that the rate determining step involves the formation of a carbocation. This means that the slowest step in the reaction involves the breaking of a bond to form a carbocation. Statement II says that there is only one transition state in the reaction profile. This means that there is only one peak in the energy diagram that corresponds to a transition state. Statement III claims that the first transition state is the slow step in the reaction. This is in agreement with Statement I, because the formation of the carbocation involves the breaking of a bond and the loss of a leaving group, which is typically a slow step in organic reactions. Statement IV correctly states that the second step involves attack by a nucleophile on the carbocation. Statement V suggests that the reaction proceeds in a polar aprotic solvent, which is typically the best solvent for SN1 reactions.

Therefore, statements I, III, and IV are true and the correct answer is A.

The Following Can Be Said About the Reaction Profile of an SN1

The Following Can Be Said About the Reaction Profile of an S_N1