JEE Main Chemistry question

CH₃MgI --X--> Y --hydrolysis--> Mg(OH)I + CH₃COOH. The reagent X in the reaction is

(A)CH₃CHO
(B)CO₂Correct
(C)(CH₃)₂CO
(D)HCHO

Answer: (B)

Solution

Since the hydrolysis product is the carboxylic acid CH₃COOH (not an alcohol), the Grignard reagent CH₃MgI must have added to carbon dioxide, not to an aldehyde or ketone: CH₃MgI + CO₂ → CH₃COOMgI (Y), and aqueous hydrolysis

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Question ID VK-149216