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JEE Main levelSingle correct optionDifficulty 2 of 3nm239

What is the IUPAC name of the compound shown? Use alphabetical order for prefixes, with N- locants for substituents on nitrogen.

  1. A2-chloro-N-methylpropanamide
  2. B2-chloro-N-methylethanamide
  3. CN-methyl-2-chloroethanamide
  4. DN-(chloromethyl)ethanamide

Answer: B

The compound is 2-chloro-N-methylethanamide. The amide is the principal group, C1 is the carbonyl carbon, chlorine is at C2 and the methyl is on nitrogen. Prefixes are in alphabetical order (chloro before methyl), so N-methyl-2-chloroethanamide is wrongly ordered.
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