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