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JEE Main levelSingle correct optionDifficulty 2 of 3g1039

Which of the following is the strongest base in water?

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

Answer: A

In aniline and its derivatives the nitrogen lone pair is delocalised into the benzene ring, which lowers its availability; a nitro group adds a further -M effect, and a second phenyl group is worse. Cyclohexylamine has a localised lone pair and a +I alkyl group, so it is the strongest base.
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