Question

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

Options

• Acidic permanganate 

• Acidic dichromate 

• Chromic anhydride in glacial acetic acid 

• Pyridinium chlorochromate

Answer 1

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

Explanation:

\[\begin{array}{cc}
\ce{OH}\phantom{.................................}\ce{O}\phantom{............}\\
|\phantom{...................................}||\phantom{............}\\
\ce{CH3 - CH - CH = CH - CH3 ->[PCC] CH3 - C - CH = CH - CH3}\\\end{array}\]

Pyridinium chlorochromate selectively oxidizes an alcoholic group in the presence of a carbon-carbon double bond.