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Quote from: apurva on October 21, 2022, 01:34:16 PM

1⁰-Amines + HONO (cold acidic solution)  →  Nitrogen Gas Evolution from a Clear Solution
Primary aliphatic amines react to give unstable diazo compounds which are not resonance stabilized and hence will break down into alcohol.
Secondary amines they give nitroso compounds.
2⁰-Amines + HONO (cold acidic solution)  →  An Insoluble Oil (N-Nitrosamine)
Even primary aromatic amines make diazo compound on amine N and in A option you can see that your amine is tertiary and diazo compound is not on amine N.
3⁰-Amines + HONO (cold acidic solution)  →  A Clear Solution (Ammonium Salt Formation)