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Some reactions of amines are given. Which one is not correct?

1. (CH3)2NH + NaNO2 + HCl → (CH3)2N–N=O
2. (CH3)2N– + NaNO2 + HCl → (CH3)2N–N=NCl
3. CH3CH2NH2 + HNO2 → CH3CH2OH + N2
4. CH3NH2 + C6H5SO2Cl → CH3NHSO2C6H5

Correct answer: (CH3)2N– + NaNO2 + HCl → (CH3)2N–N=NCl

Solution

Option B is incorrect because secondary amines react with nitrous acid to form N-nitrosoamines, not diazonium salts. Diazonium salts are formed only with primary aromatic amines.

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