A) \[C{{H}_{3}}COOH\]
B) \[C{{H}_{3}}CHO\]
C) \[C{{H}_{3}}COC{{H}_{3}}\]
D) none of these
Correct Answer: B
Solution :
Acetylene with dil. \[{{H}_{2}}S{{O}_{4}}\] in the presence of \[H{{g}^{2+}}\] ion forms aldehyde \[\underset{CH}{\overset{CH}{\mathop{|||}}}\,+\underset{OH}{\overset{H}{\mathop{|}}}\,\xrightarrow[H{{g}^{2+}}]{dil.\,{{H}_{2}}S{{O}_{4}}}\,\underset{Vinyl\,alcohol}{\mathop{\underset{CHOH}{\overset{C{{H}_{2}}}{\mathop{||}}}\,}}\,\xrightarrow{{}}\underset{CHO}{\overset{C{{H}_{3}}}{\mathop{|}}}\,\] Note: Hydration of ethyne yields aldehyde but hydratton of higher homologous of alkyne yields ketone.
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