Which species contain only π−bond among the following?
A
O2−
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B
O2
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C
B2
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D
C2−2
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Solution
The correct option is CB2
O2−
1σbond
O2
1σand1π
B2
1πbond only
C2−2
1σand2πbonds
Molecular electronic configuration of O2=σ1s2σ∗1s2σ2s2σ∗2s2σ2pxπ2p2y=π2p2z,π∗2p1y=π∗2p1z
Molecular electronic configuration of B2=σ1s2σ∗1s2σ2s2σ∗2s2π2p1y=π2p1z
Molecular electronic configuration of C2−2=σ1s2σ∗1s2σ2s2σ∗2s2π2p2y=π2p2zσ2p2x
B2 possess only π bond, rest all molecules possess sigma bond or sigma bond and pi bond.