According to molecular orbital theory, the correct order of stability in the following species is

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H2>H2+>H2-

H2+>H2->H2

H2>H2+=H2-

H2+>H2>H2-

answer is A.

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Detailed Solution

Stability ∝ Bond orderFor those species with same bond order, lesser the number of electrons in ABMO greater the stability.H2-σ1s2; B.O=2-02=1; H2+-σ1s1;B.O=1-02=0.5; H2--σ1s2σ1s*1; B.O=2-12=0.5;Since H2+ contains less number of electrons in ABMO, it is more stable than H2-

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