JEE Main Chemistry question

Which of the following will form two isomers with semicarbazide?

(A)BenzaldehydeCorrect
(B)Acetone
(C)Benzoquinone
(D)Benzophenone

Answer: (A)

Solution

Condensation of an unsymmetrical ketone/aldehyde with semicarbazide (H₂NNHCONH₂) gives a semicarbazone whose C=N bond can, in principle, show syn/anti (E/Z) geometric isomerism when the two substituents on the carbonyl carbon are different. Benzaldehyde (substituents H and Ph, both different, aromatic — a case

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Question ID VK-149171