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Complete the reaction and identify A, B,...

Complete the reaction and identify `A, B, C, D`
`CH_(3)CHOoverset(NH_(2)-NH_(2))rarr[A]overset(KOH)rarr[B]overset(Br_(2)//hv)rarr[C]overset("KOH(alc)")rarr[D]`

Text Solution

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`underset("Acetaldehyde")(CH_(3)CH=O)overset(H_(2)N-NH_(2))underset(-H_(2)O)rarrunderset("Hydrazone[A]")(CH_(3)CH=N NH_(2))underset("Heat")overset("KOH")rarrunderset("Ethane[B]")(CH_(3)CH_(3))underset(-HBr)overset(Br_(2))rarrunderset("Bromoethane[C]")(CH_(3)CH_(2)Br)overset("KOH(alc)")rarrunderset("Ethene[D]")(CH_(2)=CH_(2))`

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