A) \[7\sigma \] and \[3\pi \]
B) \[8\sigma \] and \[2\pi \]
C) \[8\sigma \] and \[4\pi \]
D) \[5\sigma \] and \[5\pi \]
Correct Answer: A
Solution :
But-l-ene-3-yne is \[H\underset{\sigma }{\mathop{-}}\,\overset{\begin{smallmatrix} H \\ {{|}_{\sigma }} \end{smallmatrix}}{\mathop{C}}\,\overset{\sigma }{\mathop{\underset{\pi }{\mathop{=}}\,}}\,\overset{\begin{smallmatrix} H \\ {{|}_{\sigma }} \end{smallmatrix}}{\mathop{C}}\,\overset{\sigma }{\mathop{-}}\,C\overset{\sigma }{\mathop{\underset{2\pi }{\mathop{\equiv }}\,}}\,\,\overset{\sigma }{\mathop{-}}\,H\] There are \[7\propto \] and \[3\pi \]-bond in but-l-ene-3-yne. Note - In \[C\equiv C\] there are two \[\pi \] and \[\sigma \]-bond is present and in \[C=C\] there are on \[\pi \] and one \[\sigma \]-bond is present.
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