Question

The compounds A and B are respectively:

• A.
• B.
• C.
• D.

Answer 1

The Correct Option is B

The reaction sequence involves the formation of a Grignard reagent from MeBr and Mg in dry ether. The Grignard reagent reacts with CO₂ (from dry ice) to form a carboxylate, which upon protonation with H₃O⁺ gives a carboxylic acid.

The correct structures of A and B are shown in option (3).