The molecule having a formyl group is:

Acetone

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Acetaldehyde

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Acetic acid

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Acetic anhydride

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Solution

The correct option is A Acetaldehyde
A formyl functional group consists of a carbonyl carbon which is bonded to a hydrogen atom.When this carbonyl carbon is attached to an R group, that formyl group is called an aldehyde.
Here in the given example $R$ group is $C H_{3} -$ group. So acetaldehyde consists of formyl group.
Hence option B is correct.

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