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Answer the following.
Identify the compounds [A] and [B] in the following reactions:
(a)[1.0]
$\text{CH}_3\text{CHO} \xrightarrow[\text{K}_2\text{Cr}_2\text{O}_7 + \text{H}_2\text{SO}_4]{[\text{O}]} \text{CH}_3\text{COOH} \xrightarrow{\text{Ca(OH)}_2} [\text{A}] \xrightarrow[\text{dry distillation}]{\Delta} [\text{B}]$
(b)[1.0]
$\text{CH}_3\text{COCH}_3 \xrightarrow[\text{K}_2\text{Cr}_2\text{O}_7 + \text{H}_2\text{SO}_4]{[\text{O}]} [\text{A}] \xrightarrow{\text{PCl}_5} \text{CH}_3\text{COCl} \xrightarrow[\text{Pd/BaSO}_4 \text{, Boiling xylene}]{\text{H}_2} [\text{B}]$
Answer
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From ISC 2025 Improvement Chemistry Paper 1, question 8(i).