question_answer

Enol content is highest in                                              [Orissa JEE 2005]

A)                 Acetone              

B)                 Acetophenone

C)                 Acetic acid          

D)                 Acetyl acetone

Correct Answer: D

Solution :

           The amount of enolic form is highest (76%) in acetyl acetone because keto group is a much better electron-withdrawing group.                                  \[\overset{{}}{\longleftrightarrow}\overset{O\,....\,H\,\,O\,\,\,\,\,}{\mathop{\overset{|\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,}{\mathop{C{{H}_{3}}C-CH=C-C{{H}_{3}}}}\,}}\,\]