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Identify the compounds A, B and C in the following reactions:
(a)[1.5]
$\text{C}_6\text{H}_5\text{NO}_2 \xrightarrow{\text{Sn} + \text{HCl}} \text{A} \xrightarrow[273\text{ K} - 278\text{ K}]{\text{NaNO}_2 + \text{HCl}} \text{B} \xrightarrow{\text{H}_2\text{O}} \text{C}$
(b)[1.5]
$\text{CH}_3\text{CN} \xrightarrow{\text{H}_2\text{O} / \text{H}^+} \text{A} \xrightarrow{\text{NH}_3 / \text{heat}} \text{B} \xrightarrow{\text{Br}_2 + \text{KOH}} \text{C}$
Answer
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From ISC 2023 Specimen Chemistry Paper 1, question 17(i).