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The addition compound obtained by treating propanone with hydrogen cyanide is:

1. propene cyanohydrin
2. ethene cyanohydrin
3. propane cyanohydrin
4. ethane cyanohydrin

Correct answer: propene cyanohydrin

Solution

Propanone reacts with HCN to form its cyanohydrin, where CN and OH add to the former carbonyl carbon. Since the starting ketone has three carbons, the product is propene cyanohydrin in the given options.

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