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Identify the compounds [A] and [B] in the following reactions:
(a)[1.0]
$\text{C}_6\text{H}_5\text{CHO} \xrightarrow[\text{(2) }\text{SOCl}_2]{\text{(1) }\text{K}_2\text{Cr}_2\text{O}_7/\text{H}_2\text{SO}_4} [\text{A}] \xrightarrow{\text{C}_6\text{H}_6(\text{anhy. }\text{AlCl}_3)} [\text{B}]$
(b)[1.0]
$\text{CH}_3\text{-C}\equiv\text{CH} \xrightarrow[\text{(2) vigorous oxidation, conc. }\text{HNO}_3]{\text{(1) }\text{H}_2\text{SO}_4/\text{HgSO}_4} [\text{A}] \xrightarrow{\text{C}_2\text{H}_5\text{OH } [\text{conc. }\text{H}_2\text{SO}_4]} [\text{B}]$
Answer
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From ISC 2025 Specimen Chemistry Paper 1, question 9(i).