Question

What is Z in the following set of reactions?

• A.
• B.
• C.
• D.

Hint:

In the presence of peroxides, HBr follows the Anti-Markovnikov rule, leading to the attachment of Br at the least substituted carbon. Williamson ether synthesis is a widely used method to prepare ethers from alkyl halides.

Answer 1

The Correct Option is C

The given reaction sequence proceeds as follows:

1. Step 1: HBr in the presence of peroxides (C₆H₅CO)₂O₂)
- This follows the Anti-Markovnikov rule due to the presence of peroxides.
- The Br attaches to the less substituted carbon, leading to the formation of 1-Bromobutane (X).

2. Step 2: Reaction with Na and Ethanol (Williamson Ether Synthesis)
- Williamson ether synthesis involves the reaction of an alkoxide ion with an alkyl halide.
- Sodium reacts with ethanol, forming ethoxide ion (C₂H₅O^-).
- The nucleophilic substitution reaction takes place between 1-Bromobutane (X) and ethoxide ion, forming Ethoxybutane (Z).

Thus, Z corresponds to the third image, making option (3) the correct choice.