MHT CET · Chemistry · Amines

Which of the following amines gives yellow oily liquid with \(\mathrm{HNO}_{2}\) ?

A Ethyl methyl amine
B Aniline
C 3 -methyl benzyl amine
D Methyl amine

Verified Solution

Answer & Solution

Correct Answer

(A) Ethyl methyl amine

Step-by-step Solution

Detailed explanation

Secondary amines, (containing - NH-group) when treated with \(\mathrm{HNO}_{2}\) give nitrosoamines which separate as yellow oily liquids. The structures of the given compounds are
(a)

(b)

(c)

(d)
\(\mathrm{CH}_{3} \mathrm{NH}_{2}\)
methyl amine
\(\left(1^{\circ}\right)\)
Among the given compounds, only ethyl methyl amine is a secondary amine, thus it gives a yellow oily liquid with \(\mathrm{HNO}_{2}\).

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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