SarkariPYQ

SSC GD 2025 PYQ — Question 27

SSC GD Const 2025 (English) - 21 Feb 2025 - Shift 2 • General Awareness • Q27

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In which functional group is the carbonyl carbon attached to the hydrogen atom as well as to the carbon?

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Correct answer: A

Explanation

The correct answer is option 1 i.e. Aldehyde.

  • The functional group in which the carbonyl carbon is bonded to one hydrogen atom and one carbon atom is known as an aldehyde.

  • The carbonyl group consists of a carbon atom double-bonded to an oxygen atom (C=O).

  • In an aldehyde (RCHO), the carbonyl carbon is attached to:

    • One hydrogen atom (H)

    • One carbon atom (R group), which is part of an alkyl or aryl group.

  • The only exception is formaldehyde (HCHO), where the carbonyl carbon is attached to two hydrogen atoms.

Other Options:

 

  • In a carboxylic acid (RCOOH), the carbonyl carbon is connected to a hydroxyl group (-OH) and a carbon atom, forming the carboxyl functional group.

  • In a ketone (RCOR′), the carbonyl carbon is bonded to two carbon atoms (either alkyl or aryl groups, R and R′) and not attached to any hydrogen atom.

  • In an amide (RCONH₂), the carbonyl carbon is bonded to a nitrogen atom (from an amino group, -NH₂) and a carbon atom, giving the compound its characteristic amide linkage.