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

Options

  1. A-CONH₂, >C=O, -CHO, -NH₂, -C C-
  2. B-CONH₂, -COOCH₃, -CHO, -NH₂, -OH
  3. C-CONH₂, -CHO, >C=O, -NH₂, -C C-
  4. D-CONH₂, -CHO, -CN, -NH₂, -C C-

Correct answer

C. -CONH₂, -CHO, >C=O, -NH₂, -C C-

Step-by-step solution

The correct order of decreasing priority for functional groups in IUPAC nomenclature is: Carboxylic acids ( -COOH ) > Sulphonic acids ( -SO₃H ) > Esters ( -COOR ) > Acid halides ( -COX ) > Amides ( -CONH₂ ) > Nitriles ( -CN ) > Aldehydes ( -CHO ) > Ketones ( >C=O ) > Alcohols ( -OH ) > Thiols ( -SH ) > Amines ( -NH₂ ) > 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 -COOCH₃ has a higher priority than -CONH₂ . Opti

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