Question

In the given conversion the compound A is:

• A.
• B.
• C.
• D.

Answer 1

The Correct Option is B

In the given conversion, the compound A is being formed from the reaction of a bromo-phenol compound with methyl lithium (CH₃Li). This reaction is a typical organolithium reaction where the lithium replaces the bromine atom on the benzene ring.

Here's the step-by-step explanation:

1. The starting material is bromophenol. When treated with methyl lithium, the lithium replaces the bromine to form a lithium compound.
2. The intermediate formed is a phenoxide ion bonded to lithium; the bromine is replaced by the lithium atom.
3. The reaction:
   C_6H_4BrOH + CH_3Li \rightarrow C_6H_4LiOH + CH_3Br

Therefore, compound A is phenoxide ion with lithium (lithium phenoxide).

The correct image for compound A is:

In subsequent steps, the lithio compound reacts with CO₂ and H₃O⁺ to form the final carboxylic acid product, salicylic acid.