Q.

The correct order of stability

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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+
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