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JEE Main levelSingle correct optionDifficulty 2 of 3g1009

In the gas phase, the correct order of basic strength of ammonia and the methylamines is

  1. A
  2. B
  3. C
  4. D

Answer: C

In the gas phase there is no solvation, so only the +I effect of the methyl groups matters. Each added methyl group makes the nitrogen lone pair more available and stabilises the ammonium ion, so basicity rises with the number of methyl groups.
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