Question -Among the following which species has same number of σ and π bonds.
Options:
A .  C7H8
B .  C2(CN)4
C .  C2H4
D .  C2H2
Answer: Option B : B C2(CN)4 molecule contains 9σ and 9 πbonds. (CN)2−C=C−(CN)2 Each C bonded to N would have 2 pi and 1 sigma bond. So that is a total of 8 pi bonds. There is one pi bond between -C=C- in the middle. The rest of the bonds are all sigma bonds - 1 each between C and N making a total of 4, 1 between the central carbon atoms, and 1 each between the central carbons and the C from CN, making a total of 9 sigma bonds.
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