[H^{2+}_2 , He_2] In which of the following pairs of molecules/ions both the species are not likely to exist?

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10th CBSE Maths

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

$H^+_2, He^{2-}_2$

$H^-_2+, He^{2-}_2$

$H^{2+}_2 , He_2$

$H^-_2, , He^{2+}_2$

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