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Functional Groups

A carboxylic ...

Question

A carboxylic group is present in ________.

A

ethylene

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B

methanoic acid

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C

formaldehyde

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D

ethanol

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Solution

The correct option is B methanoic acid
The carboxyl group is symbolized as $- C O O H$ and has both a carbonyl $(C = O)$ and a hydroxyl group $(- O H)$ attached to the same carbon atom.
Chemical formula of methanoic acid is $H C O O H$ , which can be written as $(H (C = O) - O H)$ or $(H - C O O H)$ .

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