question_answer

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

A)  pyridinium chlorochromate

B)  chromic anhydride m glacial acetic add

C)  acidic dichromate

D)  acidic permanganate

Correct Answer: B

Solution :

 \[C{{H}_{3}}-\underset{\begin{smallmatrix}  | \\  OH \end{smallmatrix}}{\mathop{CH}}\,-CH=CH-C{{H}_{3}}\xrightarrow[{}]{{}}\] \[C{{H}_{3}}-\underset{\begin{smallmatrix}  || \\  O \end{smallmatrix}}{\mathop{CH}}\,-CH=CH-C{{H}_{3}}\] Only suitable reagent is chromic anhydride in glacial acetic acid. Other will also affectbond.