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JEE Main 2025 Apr 7 Shift 2, Chemistry Q11: Properties of Amines

JEE Main2025Apr 7, Shift 2Chemistry
Q.

The descending order of basicity of following amines is :

Choose the correct answer from the options given below :

  1. A

    B > E > D > A > C

  2. B

    E > D > B > A > C

  3. C

    E > D > A > B > C

  4. D

    E > A > D > C > B

Solution

Aliphatic amines are more basic than aromatic amines because in aniline-type compounds the lone pair on nitrogen is delocalised into the benzene ring, making it less available for protonation.

Among the aliphatic amines, dimethylamine, with two electron-donating methyl groups, is more basic than methylamine with only one, so E > D.

Among the substituted anilines, an electron-donating group at the para position (B) leaves it more basic than unsubstituted aniline (A), while a strongly electron-withdrawing group at the para position (C) pulls electron density away from nitrogen by resonance, drastically lowering basicity and making it the least basic of the set.

Combining these trends: E > D > B > A > C.

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