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Which of the following structures represents vinylcarbinol?

1. HO–CH2–CH=CH2
2. CH3C(OH)=CH2
3. CH3–CH=CH–OH
4. CH3–C(CH2OH)=CH2

Correct answer: HO–CH2–CH=CH2

Solution

The correct structure for vinylcarbinol is HO–CH2–CH=CH2, which features a hydroxyl group (–OH) attached to a carbon that is part of a vinyl group (–CH=CH2), making it a vinyl alcohol.

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