For  compounds ,  A : Tetracuanoethern   B : Carbon dioxide  C: Benzene  D : 1 , 3-Butaidene .
Channel: Doubtnut
Date: 2020-08-02

For  compounds ,  A : Tetracuanoethern   B : Carbon dioxide  C: Benzene  D : 1 , 3-Butaidene .  Ratio of `sigma` and ` pi` bonds is in order :