Which of the following species contains equal number of sigma - and pi

1.	Which of the following species contains equal number of sigma - and pi- bonds?
Answer» `HCO_(3)^(-)` `XeO_(4)` `(CN)_(2)` `CH_(2) (CN)_(2)` Solution :number of `SIGMA` bonds `=4` number of `pi` bonds `=4`

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