The best reagent to convert $p e n t - 3 - e n - 2 - o l$ into $p e n t - 3 - e n - 2 - o n e$ is:

acidic permanganate

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acidic dichromate

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chromic anhydride in glacial acetic acid

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pyridinium chlorochromate

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Solution

The correct option is D pyridinium chlorochromate
$C H_{3} C H (O H) C H = C H C H_{3} \to C H_{3} - C | | O - C H = C H C H_{3}$

its an oxidation reaction.

Pyridinium chlorochromate is a mild oxidising agent that oxidises primary alcohol to aldehydes and secondary alcohols to ketones.

It does not affect any other functional group and therefore has high selectivity for oxidation of alcohols.

Whereas acidic permanganate, acidic dichromate, chromic anhydride in glacial acetic acid are strong oxidising agents.

Option D is correct.

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