JEE Main · 2026 · 02 Apr 2026 · Shift 1 · General Organic Chemistry

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

(A) $- CONH_{2}, > C = O, - CHO, - NH_{2}, - C \equiv C -$
(B) $- CONH_{2}, - COOCH_{3}, - CHO, - NH_{2}, - OH$
(C) $- CONH_{2}, - CHO, > C = O, - NH_{2}, - C \equiv C -$ ✓ Correct
(D) $- CONH_{2}, - CHO, - CN, - NH_{2}, - C \equiv C -$

Answer: (C)

Solution

Among characteristic groups the seniority falls in the order: a carboxylic acid derivative such as the amide, then the aldehyde, then the ketone, then the amine, and lowest the carbon-carbon triple bond. Applying this hierarchy to the groups listed gives the decreasing-priority sequence

- CON H_{2} > - CHO > > C = O > - N H_{2} > - C \equiv C -

JEE Main · 2026 · 02 Apr 2026 · Shift 1 · Single correct option

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