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$CH_3MgBr$ reacts with $CO_2$ followed by acidic workup. The product is
AEthanol
BAcetic acid
CMethyl formate
DAcetone
Answer & Solution
Correct answer: B. Acetic acid
Grignards add to $CO_2$ giving carboxylates: $CH_3MgBr + CO_2 \to CH_3COOMgBr \xrightarrow{H_3O^+} CH_3COOH$. This is the standard one-carbon homologation of $RX$ to $RCOOH$.
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