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CH-=CHunderset(Hg^(2+))overset(H(2)SO(4)...

`CH-=CHunderset(Hg^(2+))overset(H_(2)SO_(4)(dil)")rarr[A]underset(H_(2)O //H^(+))overset(CH_(3)MgBr)rarr[B]overset(H_(2)Cr_(2)O_(7)//H_(2)SO_(4))rarr[C]`

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`underset("Ethyne")(CH-=CH)underset(H_(2)SO_(4)//Hg^(2+))overset(H_(2)O)rarrunderset("Ethanal[A]")(CH_(3)CHO)underset(H_(2)O //H^(+))overset(CH_(3)MgBr)rarrunderset("Propan-2-ol[B]")(CH_(3)overset(OH)overset(|)(C)HCH_(3))underset("Oxidation")overset(K_(2)CrO_(2)O_(7)//H_(2)SO_(4))rarrunderset("Propanone"[C])(CH_(3)COCH_(3))`
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