$$
\mathrm{CH}_3 \mathrm{MgBr}+\mathrm{CO}_2 \stackrel{\text { Dry ether }}{\longrightarrow} Y \stackrel{\mathrm{H}_3 \mathrm{O}^{\oplus}}{\longrightarrow} Z
$$
Identify $Z$ from the following.
Ethyl acetate
Acetic acid
Propanoic acid
Methyl acetate
Solution
When Grignard's reagent is treated with $\mathrm{CO}_2$, a magnesium complex is formed, which on further hydrolysis yields monocarboxylic acid.
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