The molecule having a formyl group is

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(B) $A$ formyl group consists of a carbonyl group attached to a hydrogen atom,represented as the $-CHO$ group.The structures of the given organic comp

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acetaldehyde

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(B) $A$ formyl group consists of a carbonyl group attached to a hydrogen atom,represented as the $-CHO$ group.The structures of the given organic compounds are as follows:$(i)$ Acetone: $CH_3-CO-CH_3$$(ii)$ Acetaldehyde: $CH_3-CHO$$(iii)$ Acetic acid: $CH_3-COOH$$(iv)$ Acetic anhydride: $(CH_3CO)_2O$Since acetaldehyde contains the $-CHO$ group,it is the correct answer.Thus,the correct option is $(b)$.

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