Question

Identify the major products A and B respectively in the following set of reactions.

• A.

  

• B.

  

• C.

  

• D.

  

Answer 1

The Correct Option is A

To determine the primary products A and B, we will examine each reaction sequentially:

1. The initial compound is a cyclohexanol, substituted with a methyl group.
2. The first step involves reacting this alcohol with concentrated \(\text{H}_2\text{SO}_4\) at elevated temperatures.
3. This condition promotes alcohol dehydration, yielding an alkene.
4. Based on the starting material and Zaitsev's rule, the predominant alkene is formed via water elimination between the less sterically hindered carbons.
5. Consequently, Product A is identified as a cyclohexene derivative.
6. Subsequently, this alkene reacts with acetyl chloride (CH₃COCl) in the presence of pyridine.
7. Pyridine functions as a catalyst, facilitating the alkene's reaction with the acid chloride, leading to electrophilic addition or the formation of a more stable stereoisomer.
8. The major product, B, will be an acylated cyclohexane.

Thus, the correct representation corresponds to the depicted reaction pathway, aligning with the provided correct answer.