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Which one of the following species cannot exist ?

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a
C22-
b
He2
c
H2-
d
All of these

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detailed solution

Correct option is B

He2-σ1s2σ1s*2; Bond order =2-22=0 ;             He2 cannot exist ;

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Similar Questions

The increasing order of energies of various molecular orbitals are

 I. σ1s<σ*1s<σ2s<σ*2s<σ2pz<π2px=π2py<π*2px=π*2py<σ*2pz

 II. σ1s<σ*1s<σ2s<σ*2s<π2px=π2py<σ2pz<π*2px=π*2py<σ*2pz

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