The reaction of ${C H}_{3} M g B r$ on dry ice followed by acid hydrolysis gives:

acetic acid

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formic acid

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acetone

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acetaldehyde

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Solution

The correct option is A acetic acid
$R M g X + C O_{2} \to R C O O H$ .

Grignard reagents react with dry ice (solid $C O_{2}$ ) followed by aqueous acid work-up to give carboxylic acids. Note that the carboxylic acid contains one extra $C$ atom compared to the original halide from which the Grignard reagent was prepared.
Hence acetic acid shall be formed .(option (A))

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