Identify reactant ' $A$ ' in following reaction.

Identify reactant ' $A$ ' in following reaction.

1. HCHO
2. $\mathrm{CH}_3 \mathrm{CHO}$
3. 
   
4. $\mathrm{CH}_3 \mathrm{COOH}$

Asked in: MHT CET 2024 (15 May Shift 2)

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