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H-C-=C-H underset(H(2)SO(4))overset(HgSO...

`H-C-=C-H underset(H_(2)SO_(4))overset(HgSO_(4))(rarr)overset("dil.NaOH")(rarr)overset(Delta)(rarr)P`. The final product P is

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`underset("Ethyne")underset()(CHequivCH)overset("dil.H_(2)SO_(4))underset(HgSO_(4))rarrunderset(Ethanal (A))underset()(CH_(3)CHO)overset(dil.NaOH)rarrunderset(Aldol(B))underset()(CH_(3)CH(OH)CH_(2)CHO)overset(heat)underset(-H_(2)O)rarrunderset(But-2-enal(C))underset()(CH_(3)CH=CHCHO`
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