Chemistry · Amines · chapter 9 of 10

Class 12 Chemistry Chapter 9: Amines Assertion-reason questions with answers

2 assertion-reason questions on Amines, each with its answer and the reason, written from the NCERT chapter. For the CBSE board, JEE Main and NEET, which are set from the same NCERT chapter. Open a question's solution to check your working; then take the free test to find your next chapter. Each question gives an Assertion (A) and a Reason (R); choose how they stand to each other.

Question 1
Assertion (A): Aniline reacts with bromine water at room temperature to give a white precipitate of 2,4,6-tribromoaniline. Reason (R): The –NH₂ group is a powerful activating group that makes the ortho and para positions centres of high electron density.
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Answer: (a) Both A and R are true, and R is the correct explanation of A.

Both true, and R explains A: the strongly activating –NH₂ makes all three ortho and para positions react with bromine without a catalyst.

Question 2
Assertion (A): Propan-1-amine dissolves in water. Reason (R): Propan-1-amine gives a foul-smelling isocyanide when heated with chloroform and ethanolic KOH.
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Answer: (b) Both A and R are true, but R is not the correct explanation of A.

Both true. A lower aliphatic amine dissolves because it hydrogen bonds with water; the carbylamine reaction shows only that it is primary and does not explain its solubility.

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