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JEE Main2026Apr 2, Shift 1Chemistry
Q.

In IUPAC nomenclature, the correct order of decreasing priority of functional group is :

  1. A

    1

  2. B

    2

  3. C

    3

  4. D

    4

Solution

The IUPAC priority of principal characteristic groups (for choosing the senior parent and suffix) decreases roughly as: carboxylic acid > ester > amide > nitrile > aldehyde > ketone > alcohol > amine > alkyne > alkene.

Among the listed groups, the only ordering consistent with this hierarchy is amide () > aldehyde () > ketone () > amine () > alkyne (), which is option (3).

Options (1) and (4) swap aldehyde with ketone or with nitrile; option (2) places ester below amide, but in the listed priority the carboxylic-acid derivative ester actually ranks above amide, so the chain given is also incorrect.

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