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JEE MAIN Chemistry QUESTION #5571
Question 1
Arrange the following amines in increasing order of basicity: (a) vinylamine, (b) allylimine (secondary, =NH), (c) compound with $NH_2$ and $=NH$ groups, (d) $N$-methylamine
  • (b) < (a) < (d) < (c)✔️
  • (d) < (b) < (a) < (c)
  • (a) < (b) < (c) < (d)
  • (b) < (a) < (c) < (d)
Correct Answer Explanation
Basicity depends on electron availability on N. Imine-type N (sp² hybridized, as in =NH) is less basic than amine-type N (sp³). Among aliphatic amines, alkyl groups increase basicity. The increasing basicity order from the JEE 2018 question: (b) < (a) < (d) < (c), where the aliphatic secondary amine (c) is most basic.