Which one of the following is bi functional compound?

Formic acid

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Acetic acid

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Benzoic acid

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Cinnamic acid

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Solution

The correct option is C Benzoic acid
Benzoic acid $P h - C O O H$ is bi functional compound. It has two different functional groups, carboxylic groups and aromatic ring.
Cinnamic acid $P h - C H = C H - C O O H$ is tri functional compound. It has three different functional groups, carboxylic groups, carbon carbon double bond of alkenes and aromatic ring.
Formic acid $H C O O H$ and acetic acid $C H_{3} - C O O H$ are monofunctional compounds. They contain only one functional group, carboxylic group.

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