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Grignard reagent forms addition product with bubbled carbon dioxide which on hydrolysis with HCl yields benzoic acid.

1. MgBr + CO2 → OMgBr → Benzoic acid
2. MgBr + CO2 → OMgBr → Benzoic acid + Mg(OH)Br
3. MgBr + CO2 → OMgBr → Benzoic acid + HCl
4. MgBr + CO2 → OMgBr → Benzoic acid + HCl + Mg(OH)Br

Correct answer: MgBr + CO2 → OMgBr → Benzoic acid + Mg(OH)Br

Solution

Grignard reagents react with CO2 to form a carboxylate intermediate, which upon hydrolysis with HCl yields the corresponding carboxylic acid and a byproduct, Mg(OH)Br.

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