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Question 69 of 70

Q.What is meant by functional group ?

Tamil Nadu DgeTamil Nadu HSC First Year (DGE) Board 2026Subjective· 2mImportance★★★★★est
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The question asks for the meaning of a functional group in organic chemistry.

A functional group is the atom or group of atoms in a molecule that is chiefly responsible for its characteristic chemical reactions.

A functional group is a specific atom or group of atoms attached to a carbon skeleton that gives an organic compound its characteristic chemical properties. All members of a family that contain the same functional group undergo similar reactions, so the functional group determines the class and reactivity of the compound.

Examples:

  • -OH (hydroxyl group) → alcohols (e.g. CH3OH)
  • -CHO (aldehyde group) → aldehydes (e.g. CH3CHO) …
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