question_answer

How, many sigma and it-bonds are there in the following compound? \[C{{H}_{2}}=CH-C\equiv C-\overset{\begin{smallmatrix}  C{{H}_{3}} \\  | \end{smallmatrix}}{\mathop{C}}\,=C{{H}_{2}}\]

A) \[11\sigma ,\,\,4\pi \]                   

B) \[12\sigma ,\,\,3\pi \]

C) \[14\sigma ,\,\,4\pi \]                   

D) \[15\sigma ,\,\,4\pi \]

Correct Answer: C

Solution :

Key Idea: First bond between any two atoms is sigma and restore pi bonds. Structure \[14\sigma \]and\[4\pi \]bonds are there.