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A primary aliphatic amine with nitrous acid in cold (273 K) and thereafter raising temperature of reaction mixture to room temperature (298 K), gives

1. nitrile
2. alcohol
3. diazonium salt
4. secondary amine

Correct answer: alcohol

Solution

When a primary aliphatic amine reacts with nitrous acid at low temperatures, it forms a diazonium salt, which is unstable. Upon raising the temperature, this intermediate decomposes to produce an alcohol through hydrolysis.

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