A) \[{{H}_{3}}C-\underset{OD}{\mathop{\underset{\mathbf{|}}{\mathop{C}}\,}}\,=C{{H}_{2}}\]
B) \[{{H}_{3}}C-\underset{O}{\mathop{\underset{\mathbf{||}}{\mathop{C}}\,}}\,-C{{D}_{3}}\]
C) \[{{H}_{2}}C=\underset{OH}{\mathop{\underset{\mathbf{|}}{\mathop{C}}\,}}\,-C{{H}_{2}}D\]
D) \[{{H}_{2}}C=\underset{OH}{\mathop{\underset{\mathbf{|}}{\mathop{C}}\,}}\,-CH{{D}_{2}}\]
E) \[{{D}_{2}}C=\underset{OD}{\mathop{\underset{\mathbf{|}}{\mathop{C}}\,}}\,-C{{D}_{3}}\]
Correct Answer: A
Solution :
\[\underset{enol\,form\,\,of\,acetone}{\mathop{C{{H}_{3}}-\underset{OH}{\mathop{\underset{\mathbf{|}}{\mathop{C}}\,}}\,=C{{H}_{2}}}}\,+{{D}_{2}}O\to {{H}_{3}}C-\underset{OD}{\mathop{\underset{\mathbf{|}}{\mathop{C}}\,}}\,=C{{H}_{2}}\]
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