A) \[C{{H}_{3}}C{{H}_{2}}COC{{H}_{3}}\]
B) \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}CHO\]
C) \[C{{H}_{3}}C{{H}_{2}}CHO+HCHO\]
D) \[C{{H}_{3}}C{{H}_{2}}COOH+HCOOH\]
Correct Answer: A
Solution :
\[\underset{\text{But}-\text{1}-\text{yne}}{\mathop{C{{H}_{3}}-C{{H}_{2}}-C\equiv }}\,CH+{{H}_{2}}O\to \] \[\left[ C{{H}_{3}}-C{{H}_{2}}-\overset{OH}{\mathop{\overset{|\,\,\,\,}{\mathop{C\,}}\,}}\,=C{{H}_{2}} \right]\underset{\text{tautomerism}}{\mathop{\xrightarrow{\text{keto-enol}}}}\,\]\[\underset{\text{Butan}-\text{2}-\text{one}}{\mathop{C{{H}_{3}}-C{{H}_{2}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-C{{H}_{3}}}}\,\]
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