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Using MO theory predict which of the following species has the shortest bond length?

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a
O22-
b
O22+
c
O2-

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detailed solution

Correct option is B

 Molecularorbitalconfigurationof O2+:  σ1s2>σ1s2>σ2s2>σ2s2>σ2px2>π2py2=π2pz2>π2py1=π2pz0  Bondorderof O2+=NbNa2=1052=2.5  Molecularorbitalconfigurationof O2:  σ1s2>σ1s2>σ2s2>σ2s2>σ2px2>π2py2=π2pz2>π2py2=π2pz1  Bondorderof O2=1072=1.5  Molecularorbitalconfigurationof O22  σ1s2>σ1s2>σ2s2>σ2s2>σ2px2>π2py2=π2pz2>π2py2=π2pz2  Bondorderof O22=1082=1  Molecularorbitalconfigurationof O22+  σ1s2>σ1s2>σ2s2>σ2s2>σ2px2>π2py2=π2pz2>π2py0=π2pz0  Bondorderof O22+=1042=3  Bondorder 1 Bondlength   SoO22+ hastheshortestbondlength

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