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