A) Propene
B) Butene-2
C) Propyne
D) None of these
Correct Answer: C
Solution :
Alkynes on addition of water in the presence of dil.\[{{H}_{2}}S{{O}_{4}}\]and\[HgS{{O}_{4}}\]give aldehydes or ketones. Ethyne gives aldehyde while all other alkynes give ketone on hydra tion. \[\underset{\Pr opyne}{\mathop{C{{H}_{3}}C\equiv CH}}\,+{{H}_{2}}O\xrightarrow[HgS{{O}_{4}}]{dil.\,{{H}_{2}}S{{O}_{4}}}C{{H}_{3}}-\overset{\begin{smallmatrix} OH \\ | \end{smallmatrix}}{\mathop{C}}\,=C{{H}_{2}}\]\[\xrightarrow{rearrangement}\underset{acetone}{\mathop{C{{H}_{3}}-\overset{\begin{smallmatrix} OH \\ | \end{smallmatrix}}{\mathop{C}}\,=C{{H}_{2}}}}\,\]
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