Which of the following is/are functional groups?

Hydroxyl group

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Aldehyde group

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Carboxylic group

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All of the above

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Solution

The correct option is D All of the above
In organic chemistry, functional groups are specific groups of atoms or bonds within molecules that are responsible for the characteristic chemical reactions of those molecules.
Examples: (i) alcoholic group (-OH)
(ii) aldehyde group (-CHO)
(iii) ketone group (-CO)
(iv) carboxylic acid group (-COOH)

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