In which of the following pairs of molecules / ions, both the species are not likely to exist?

Engineering

Chemistry

Molecular Orbital Theory or MOT

Question

H₂⁺, He₂^2–

H₂¯, He₂²⁺

H₂¯, He₂^2–

H₂²⁺, He₂

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H₂²⁺ , He₂ Bond order = 0

so both species are not likely to exist.