The species with least bond order is

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O2+

O2-

O2-2

answer is D.

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Detailed Solution

O2-2 - 18 e-Bond order =12no.of bonding e--no.of antibonding e-=12(10-8)=1O2-2; σ1s2 σ1s2* σ2s2 σ2s2* σ2pz2 π2px2 ≈π2py2 π2px2* ≈π2py2*

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