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JEE Main levelSingle correct optionDifficulty 2 of 3el247

The amine shown is heated with an excess of methyl bromide. Which structure shown is the product, which behaves as a cationic detergent?

  1. AStructure A
  2. BStructure B
  3. CStructure C
  4. DStructure D

Answer: B

The amine shown is dodecylamine. Repeated N-alkylation by CH3Br adds three methyl groups to give dodecyltrimethylammonium bromide, a quaternary ammonium salt (a cationic detergent). The other structures are partial methylation products or amides, which are not cationic detergents.
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