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a
H2 > H2+ > He2 > He2+
b
H2 > He2+ > H2+ > He2
c
H2 > H2+ > He2+ > He2
d
H2 > He2 > H2+ > He2+
answer is C.
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Detailed Solution
Zero Bond order mean that molecule can't exist, & fractional bond order means unstable.Among H2+ and He2+ in H2+ electrons present only in BMO where as in He2+ electrons present both in BMO & ABMO hence He2+ is less stable than H2+