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Question

Which of the following have identical bond order ?

A
O2+2
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B
N2
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C
C2+2
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D
C22
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Solution

The correct options are
A O2+2
B N2
D C22
Bond order for O2+2 is:
(162=14)O2+2=σ1s2 σ1s2 σ2s2 σ2s2 σ2P2z π2P2x=π2P2y
Bond order =1042=62=3

Bond order for N2 is
(7+7)N2=14
σ1s2 σ1s2 σ2s2 σ2s2 π2P2x=π2P2y σ2P2z
Bond order =NbNa2
=1042=62=3

Bond order for C2+2 is:
(6+62)C2+2=10 σ1s2 σ1s2 σ2s2 σ2s2 π2P1x=π2P1y
Bond order =NbNa2
=642=22=1

Bond order for C22 is:
(6+6+2)C22=14
σ1s2 σ1s2 σ2s2 σ2s2 π2P2x=π2P2y σ2P2z
Bond order =NbNa2
=1042=3
Hence option A, B and D are correct.

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