A) presence of carbonyl group on each side of \[-C{{H}_{2}}-group\]
B) resonance stabilisation of enol form
C) presence of methylene group
D) rapid chemical exchange
Correct Answer: B
Solution :
Resonance stabilisation of enol form as shown \[\underset{enol\,form}{\mathop{C{{H}_{3}}-\overset{\begin{smallmatrix} O \\ | \end{smallmatrix}}{\mathop{C}}\,\overset{\begin{smallmatrix} - \\ \end{smallmatrix}}{\mathop{=}}\,}}\,\overset{\begin{smallmatrix} H \\ \end{smallmatrix}}{\mathop{CH}}\,\overset{\begin{smallmatrix} ....... \\ \end{smallmatrix}}{\mathop{-}}\,\overset{\begin{smallmatrix} O \\ | \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{3}}\underset{{}}{\longleftrightarrow}\] \[C{{H}_{3}}-\underset{C-}{\overset{O.....}{\mathop{||}}}\,\underset{CH=}{\overset{H-}{\mathop{{}}}}\,\underset{C-C{{H}_{3}}}{\overset{O}{\mathop{|}}}\,\]
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