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According to Molecular orbital theory wh...

According to Molecular orbital theory which of the following is correct ?

A

`LUMO` level for `C_(2)` molecule is a `sigma 2p` orbital

B

In `C_(2)` molecule both the bonds are `pi` bonds

C

In `C_(2)^(2-)` ion there is one `sigma `and two `pi` bonds

D

all the above are correct.

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