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Identify the compounds [A], [B] and [C] in the following reactions:
(a)[1.5]
$\text{CH}_3\text{COOH} \xrightarrow[\Delta]{\text{NH}_3} [\text{A}] \xrightarrow{\text{Br}_2 + \text{KOH}} [\text{B}] \xrightarrow{\text{CHCl}_3 + \text{NaOH (alc)}} [\text{C}]$
(b)[1.5]
$\text{CH}_3\text{Br} \xrightarrow{\text{KCN}} [\text{A}] \xrightarrow{\text{LiAlH}_4} [\text{B}] \xrightarrow[273\text{ K}]{\text{HNO}_2} [\text{C}]$
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From ISC 2023 Chemistry Paper 1, question 17(i).