Question
In IUPAC nomenclature, the correct order of decreasing priority of functional group is :
JEE Main
Chemistry
General Organic Chemistry
2026
JEE Main 2026 (02 April Shift 1)
JEE Main Chemistry Question (2026) — Solution
Options
- A. -CONH_2, >C=O, -CHO, -NH_2, -C C-
- B. -CONH_2, -COOCH_3, -CHO, -NH_2, -OH
- C. -CONH_2, -CHO, >C=O, -NH_2, -C C-
- D. -CONH_2, -CHO, -CN, -NH_2, -C C-
Answer
C. -CONH_2, -CHO, >C=O, -NH_2, -C C-
Step-by-step solution
The correct order of decreasing priority for functional groups in IUPAC nomenclature is: Carboxylic acids (-COOH) > Sulphonic acids (-SO_3H) > Esters (-COOR) > Acid halides (-COX) > Amides (-CONH_2) > Nitriles (-CN) > Aldehydes (-CHO) > Ketones (>C=O) > Alcohols (-OH) > Thiols (-SH) > Amines (-NH_2) > Alkynes (-C C-). Checking the given options: Option (A) is incorrect because -CHO has a higher priority than >C=O. Option (B) is incorrect because -COOCH_3 has a higher priority than -CONH_2. Option (C) correctly follows the priority order: -CONH_2 > -CHO > >C=O > -NH_2 > -C C-. Option (D) is incorrect because -CN has a higher priority than -CHO. Answer: -CONH_2, -CHO, >C=O, -NH_2, -C C-
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