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Question

The amine 'A' when treated with nitrous acid gives a yellow oily substance. The amine ‘A’ is:


A

Tri ethyl amine

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B

Tri methyl amine

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C

Aniline

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D

Methyl phenyl amine

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Solution

The correct option is D

Methyl phenyl amine


Explanation of correct option

Secondary (2°)amines [Methylphenylamine]react with HNO2producing an insoluble oil (N-Nitrosoamine)

PhNHCH3(aq)Methylphenylamine+HON=O(aq)nitrousacidPhN(CH3)N=O(aq)N-Nitrosoamine+H2O(l)Water

Explanation of Incorrect option.

(C) - Aniline.

Aniline reacts with nitrous acid to form phenol.

(A) -Tri ethyl amine

The result is different in this case. Here nothing special happens and you are left with a colourless solution.

There is a formation of an ion by reaction with an acid present.

(B) - Tri methyl amine

The result is different in this case. Here nothing special happens and you are left with a colourless solution.

There is a formation of an ion by reaction with an acid present((Ammonium Salt Formation)

Tertiary(3°) amines[Like Triethylamine and trimethylamine] react with HNO2produces a clear solution (Ammonium Salt Formation)

Hence, Option(D) is correct.


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