What is the intermediate B in the synthesis shown above?
A)I
B)II
C)III
D)IV

Question

What is the intermediate B in the synthesis shown above? 
A)I 
B)II 
C)III 
D)IV

Quizplus · Accepted Answer

In the synthesis shown above, B is reacted with a Grignard reagent (RMgX) to form an alcohol intermediate, which is then converted to the final product via a dehydration reaction. The only intermediate that could potentially react with a Grignard reagent to form an alcohol is III, which has a carbonyl group that could be attacked by the nucleophilic Grignard reagent. Therefore, C)III is the best choice for the intermediate B.

What Is the Intermediate B in the Synthesis Shown Above