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Question 820004
JEE Chemistry · Medium

Amines: Basicity order MCQ

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Basicity orderMediumQuestion 820004

Question

The correct order of basicity in aqueous solution for methylamines is:
  1. A
    (CH₃)₂NH > CH₃NH₂ > (CH₃)₃N > NH₃
    Correct
  2. B
    (CH₃)₃N > (CH₃)₂NH > CH₃NH₂ > NH₃
  3. C
    NH₃ > CH₃NH₂ > (CH₃)₂NH > (CH₃)₃N
  4. D
    All equal

Correct answer

(CH₃)₂NH > CH₃NH₂ > (CH₃)₃N > NH₃

Explanation

In aqueous solution (Kb values), basicity is affected by inductive effect (more alkyl = more +I = more basic) AND solvation of ammonium ion. 2° > 1° > 3° > NH₃ due to solvation counteracting the inductive effect at 3°.

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