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The number of possible isomers of the compound with molecular formula C4H8O is

1. 3
2. 5
3. 7
4. 9

Correct answer: 7

Solution

The molecular formula C4H8O corresponds to compounds with one degree of unsaturation. These include aldehydes, ketones, and cyclic alcohols. By considering all structural possibilities, there are 7 isomers.

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