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

  • Option 1)

    acidic permanganate

  • Option 2)

    acidic dichromate

  • Option 3)

    chromic anhydride in glacial acetic acid

  • Option 4)

    pyridinium chloro­-chromate

 

Answers (1)

As we learnt in

Oxidation of alcohol -

–  Also known as dehydrogenation reaction.

–  Tertiary alcohol do not undergo oxidation due to lack of \alpha -  hydrogen

- wherein

1.\:\:RCH_{2}-OH+[O]\rightarrow RCHO\rightarrow RCOOH
 

2.\:\:RCH_{2}-OH+[O]+PCC\rightarrow RCHO
 

3.\:\:R-CH(OH)-R'+CrO_{3}\rightarrow R-CO-R'

 

 

  Pyridinium chloro-chromate (PCC) is specific for the conversion.


Option 1)

acidic permanganate

This option is incorrect.

Option 2)

acidic dichromate

This option is incorrect.

Option 3)

chromic anhydride in glacial acetic acid

This option is incorrect.

Option 4)

pyridinium chloro­-chromate

This option is correct.

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