A) Propyne
B) Ethene
C) Propene
D) Ethyne
Correct Answer: A
Solution :
Alkynes on hydration give ketones except ethyne that gives aldehyde. Hence, propyne gives ketone. \[C{{H}_{3}}-C\equiv CH\xrightarrow[{}]{{{H}_{2}}O}C{{H}_{3}}-\overset{\begin{smallmatrix} OH \\ | \end{smallmatrix}}{\mathop{C}}\,=C{{H}_{2}}\] \[\xrightarrow[{}]{Tautomerises}\underset{Ketone}{\mathop{C{{H}_{3}}-\overset{\begin{smallmatrix} O \\ |\,| \end{smallmatrix}}{\mathop{C}}\,=C{{H}_{3}}}}\,\]
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