question_answer

Which of the following species contains equal number of\[\sigma -\]and\[\pi -\]bonds?

A) \[{{(CN)}_{2}}\]

B) \[C{{H}_{2}}{{(CN)}_{2}}\]

C)  \[HCO_{3}^{-}\]

D) \[Xe{{O}_{4}}\]

Correct Answer: D

Solution :

\[C{{H}_{2}}{{(CN)}_{2}}\,\,\,\,\,\,N\equiv C-\underset{H}{\overset{N}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,-C\equiv N(6\sigma +4\pi )\] \[{{(CN)}_{2}}\,\,\,\,\,\,N\equiv C-C=N(3\sigma +4\pi )\]