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

$straight H subscript 2 superscript plus comma space He subscript 2 superscript 2 minus end superscript$
$straight H subscript 2 superscript minus comma space He subscript 2 superscript 2 minus end superscript$
$straight H subscript 2 superscript 2 plus end superscript comma He subscript 2$
$straight H subscript 2 superscript minus comma space He subscript 2 superscript 2 plus end superscript$

Solution

straight H subscript 2 superscript 2 plus end superscript comma He subscript 2

species which have zero or negative bond order does not exist.

Some More Questions From Chemical Bonding and Molecular Structure Chapter

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