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Which of the following compounds will most readily be dehydrated to give alkene under acidic condition ? [JEE-Main On line-2018]

1. 4-Hydroxypentan-2-one
2. 3-Hydroxypentan-2-one
3. 1-Pentanol
4. 2-Hydroxycyclopentanone

Correct answer: 4-Hydroxypentan-2-one

Solution

4-Hydroxypentan-2-one has a hydroxyl group adjacent to a carbonyl group, which facilitates the formation of a stable carbocation upon dehydration under acidic conditions, making it more reactive compared to the other options.

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