A) 5 sigma and 5 pi
B) 8 sigma and 3 pi
C) 8 sigma and 2 pi
D) 7 sigma and 2 pi
Correct Answer: B
Solution :
The structure ofbut-l-en-3-yne is as: \[H\underset{\sigma }{\overset{\sigma }{\mathop{-}}}\,\underset{\begin{smallmatrix} | \\ H \end{smallmatrix}}{\mathop{C}}\,\underset{\pi }{\overset{\sigma }{\mathop{=}}}\,\underset{\begin{smallmatrix} | \\ H \end{smallmatrix}}{\mathop{C}}\,\underset{\sigma }{\overset{\sigma }{\mathop{-}}}\,C\underset{\sigma }{\overset{2\pi }{\mathop{\equiv }}}\,C\overset{\sigma }{\mathop{-}}\,H\] Hence,\[8\sigma \]and\[3\pi -\]bonds are present in but-1-en-3-yne.
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