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When ethyl isocyanide is hydrolysed in an acidic medium, which products are formed?

1. propanoic acid and an ammonium salt
2. ethanoic acid and an ammonium salt
3. methylamine salt and ethanoic acid
4. ethylamine salt and methanoic acid

Correct answer: ethylamine salt and methanoic acid

Solution

Acidic hydrolysis of an isocyanide (R-NC) gives a primary amine and formic acid. Ethyl isocyanide therefore yields ethylamine (as its salt) and methanoic (formic) acid.

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