Nitrosamines \( (R_2N - N = O) \) are soluble in water. On heating them with concentrated \( H_2SO_4 \), they give secondary amines. This reaction is called:
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The Liebermann nitroso reaction is a common method for converting nitrosamines into secondary amines under acidic conditions.
Step 1: The reaction of nitrosamines with concentrated \( H_2SO_4 \) forms secondary amines and is classified as a nitroso reaction. Step 2: The reaction follows the mechanism of the Liebermann nitroso reaction, which involves the formation of secondary amines.
Final Answer:
\[
\boxed{\text{Liebermann nitroso reaction}}
\]