question_answer

Which of the following species contains equal number of \[\sigma \] and \[\pi \]-bonds?                         [NEET 2015 ]

A)  \[HCO_{3}^{-}\]        

B)       \[Xe{{O}_{4}}\]          

C)  \[{{(CN)}_{2}}\]         

D)  \[C{{H}_{2}}{{(CN)}_{2}}\]

Correct Answer: B

Solution :

           

	Structure	\[\sigma \] and \[\pi \] bonds
[a]		\[\sigma \] bond - 4 \[\pi \] bond-1
[b]		\[\sigma \]bond-4 \[\pi \] bond-4
[c]	\[N\equiv C-C\equiv N\]	\[\sigma \] bond-3 \[\pi \] bond-4
[d]		\[\sigma \] bond-6 x bond-4