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HC-=CHoverset(HgSO(4)//H(2)SO(4))rarr[A]...

`HC-=CHoverset(HgSO_(4)//H_(2)SO_(4))rarr[A]overset("Oxidation")rarr[B]overset(PCl_(5))rarr[C]overset(H_(2))underset(Pd//BaSO_(4))rarr[D]underset(H_(3)O^(+))overset(CH_(3)MgBr)rarr[E]`

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To solve the given question, we will go through each step of the reaction sequence, identifying the products A, B, C, D, and E. ### Step 1: Reaction of Ethyne with HgSO4 and H2SO4 **Starting Compound:** Ethyne (HC≡CH) When ethyne reacts with mercuric sulfate (HgSO4) in the presence of sulfuric acid (H2SO4), it undergoes hydration to form an aldehyde. The reaction can be summarized as follows: \[ \text{HC≡CH} + \text{HgSO}_4 + \text{H}_2\text{SO}_4 \rightarrow \text{CH}_3\text{CHO} \] ...
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