JEE Main 2018 — Alcohols Phenols and Ethers Question with Solution
JEE Main 2018 (16 Apr Online)
Question
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Step-by-step explanation
3-Hydroxypentan-2-one and 4-Hydroxypentan-2-one will most readily be dehydrated to give alkene under acidic condition. This will lead to formation of α−β unsaturated ketone (conjugated system). But out of both 4-Hydroxypentan-2-one will most readily dehydrate to give alkene under acidic condition since the carbocation formed will be more stable than in the case of 3-Hydroxypentan-2-one.
Dehydration of 2-Hydroxycyclopentanone will lead to C=C double bond in 5 member ring that will cause strain and product is less likely to be formed.
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This is a previous-year question from JEE Main 2018, covering the Alcohols Phenols and Ethers chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.