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The number of sigma (sigma) and p i(pi) ...

The number of sigma `(sigma)` and `p i(pi)` bonds present in a molecule of tetracyanoethene is

A

`9 sigma` and `9pi`

B

`9 sigma` and `7pi`

C

`5sigma` and `9pi`

D

`5sigma` and `8pi`

Text Solution

Verified by Experts

The correct Answer is:
A
Draw the structure of tetracyanoethene. It is derived from ethene `(CH_2=CH_2)` molecule by replacing all the `4H` atoms by cyanide groups `(-C-=N)`:

Every single bond is a sigma bond, a double bond contains one sigma and one `pi` bond, and every triple bond contains one sigma and two pi bonds.
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