A) \[5\sigma ,5\pi \]
B) \[7\sigma ,3\pi \]
C) \[8\sigma ,6\pi \]
D) \[6\sigma ,4\pi \]
Correct Answer: B
Solution :
\[7\sigma \]and\[3\pi \]bonds are present in 1-butene-3-yne \[H\overset{\sigma }{\mathop{-}}\,\underset{\begin{smallmatrix} |\sigma \\ H \end{smallmatrix}}{\mathop{C}}\,\overset{\sigma }{\mathop{\underset{\pi }{\mathop{=}}\,}}\,\underset{\begin{smallmatrix} |\sigma \\ H \end{smallmatrix}}{\mathop{C}}\,\overset{\sigma }{\mathop{-}}\,C\overset{\sigma }{\mathop{\underset{\pi }{\mathop{\equiv }}\,}}\,C\overset{\sigma }{\mathop{-}}\,H\]
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