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Which one of the following species is diamagnetic having a bond order one.

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a
Li2
b
B2
c
He2
d
C2

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detailed solution

Correct option is A

C2 - Diamagnetic - 2Li2 - Diamagnetic - 1B2 - Paramagnetic - 1He2 - Does not exist.Li2-σ1s2σ1s*2 σ2s2; Bond order =4-22=1 ;

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The increasing order of energies of various molecular orbitals are

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