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  4. The best reagent to convert pent-3-en-2-ol into pent-3-en-2-one is

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Q. The best reagent to convert pent-3-en-2-ol into pent-3-en-2-one is

BHUBHU 2011

Solution:

Sol. Pyridinium chlorochromate oxidises an alcoholic group selectively in the presence of carbon-carbon double bond.
$ C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ OH \end{smallmatrix}}{\mathop{CH}}\,-CH=CH-C{{H}_{3}}\xrightarrow[{}]{PCC} $ $ C{{H}_{3}}-\underset{\begin{smallmatrix} |\,| \\ O \end{smallmatrix}}{\mathop{CH}}\,-CH=CH-C{{H}_{3}} $