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CH-=CHunderset(HgSO(4)//H(2)SO(4))overse...

`CH-=CHunderset(HgSO_(4)//H_(2)SO_(4))overset(H_(2)O)to[A]overset(LiAlH_(4)//H)to[B]underset(443 K)overset(H_(2)SO_(4)(conc.))to[C]`

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To solve the question step by step, we need to identify the compounds A, B, and C based on the reactions described. ### Step 1: Reaction of Acetylene with Water The first reactant given is acetylene (C2H2). When acetylene reacts with water in the presence of mercuric sulfate (HgSO4) and sulfuric acid (H2SO4), it undergoes hydrolysis to form an aldehyde. **Reaction:** \[ \text{C}_2\text{H}_2 + \text{H}_2\text{O} \xrightarrow{\text{HgSO}_4, \text{H}_2\text{SO}_4} \text{CH}_3\text{CHO} \] ...
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