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Q.

The species having highest bond energy is :

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a

O2

b

O2+

c

O2

d

O22

answer is D.

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Detailed Solution

O22 has highest bond energy.

Here, 

O22=KKσ2s2,σ2s2,σ2pz2,π2pz2,π2py2,2px2,π2py2

 Bond order =NbNa2=862=1

O2+=KKσ2s2,σ2s2,σ2pz2,π2pK2π2py2,π2pr1

 Bond order =832=2.5

O2=KKσ2s2σ2s2,σ2p22,π2pα2π2py2π2pK2π2py1

 Bond order =852=1.5

O2=KKσ2s2;σ2s2,σ2pz2,π2pπ2π2py22px1π2py1

 Bond order =842=2

 Bond energy 1 Bond order 

O22 has highest bond energy.

Hence correct option is D.

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