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According to molecular orbital theory, the species among the following that does not exist is:


a. He2-
b. He2+
c. O22-
d. Be2
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The correct answer is  d)  Be2   

According to M.O.T. If bond order of chemical species is zero then that chemical species does not exist  

Chemical species Bond Order
\(He_2^{-}\) 0.5
\(He_2^+\) 0.5
\(O^{2-}_2\) 1
\(Be_2\) 0


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