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Question

Which of the following facts regarding change in bond length is correct?

A
Increases in going from N2 to N+2, decreases in going from O2 to O+2
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B
Decreases in going from N2 to N+2, decreases in going from O2 to O+2
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C
Increases in going from N2 to N+2 and O2 to O+2
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D
Decreases in going from N2 to N+2 and O2 to O+2
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Solution

The correct option is A Increases in going from N2 to N+2, decreases in going from O2 to O+2
The electronic configuration of N2 and O2 are as follows:
N2:σ(1s)2σ(1s2)σ(2s)2σ(2s)2π(2px)2π(2py)2σ(2pz)2
O2:σ(1s)2σ(1s2)σ(2s)2σ(2s)2σ(2pz)2π(2px)2π(2py)2π(2px)1π(2py)1
Going from N2 to N+2, one bonding electron is removed. This decreases the bond order and hence increases the bond length. Going from O2 to O+2, one antibonding electron is removed. This increases the bond order and hence decreases the bond length.

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