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According to molecular orbital theory

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By Expert Faculty of Sri Chaitanya
a
C22− is expected to be diamagnetic
b
O22+ is expected to have a longer bond length than O2
c
N2+and N2−have the same bond order
d
He2+has the same energy as two isolated He atoms.

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detailed solution

Correct option is A

(1)  is true because all electrons are paired. (2)  is false. Bond length of O22+< bond length of O2. (3) is true because both have same bond order (2.5). (4)  is false.
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