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Question

Which species contain only πbond among the following?

A
O2
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B
O2
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C
B2
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D
C22
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Solution

The correct option is C B2
O2 1 σ bond
O2 1 σ and 1 π
B2 1 π bond only
C22 1 σ and 2 π bonds

Molecular electronic configuration of O2=σ1s2σ1s2σ2s2σ2s2σ2pxπ2p2y=π2p2z,π2p1y=π2p1z
Molecular electronic configuration of B2=σ1s2σ1s2σ2s2σ2s2 π2p1y=π2p1z
Molecular electronic configuration of C22=σ1s2σ1s2σ2s2σ2s2 π2p2y=π2p2zσ2p2x

B2 possess only π bond, rest all molecules possess sigma bond or sigma bond and pi bond.

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