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Nitrosamines of the type R2N–N=O are not soluble in water. When they are heated with concentrated H2SO4, they yield secondary amines. This transformation is known as the

1. Liebermann nitroso reaction
2. Etard reaction
3. Fries reaction
4. Perkin reaction

Correct answer: Liebermann nitroso reaction

Solution

The conversion/colour reaction of N-nitrosamines (R2N-N=O) with concentrated H2SO4, used to detect secondary amines, is the Liebermann nitroso reaction.

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