H2 is a stable molecule, but Why C2 is not?

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The correct statement with regard to $H_{2}^{+}$ & $H_{2}^{-}$ is

H_{2}

H e - H

H e - H

Question 19

Which of the following statement is not correct from the view point molecular orbital theory?

(a) $B e_{2}$ is not a stable molecule

(b) $H e_{2}$ is not stable but $H e_{2}^{+}$ is expected to exist.

(d) The order of energies of molecular orbitals in $N_{2}$ molecule is

$σ 2 s < σ^{*} 2 s < σ 2 p_{z} < (π^{*} 2 p_{x} ≃ π^{*} 2 p_{y}) < σ^{*} 2 p_{z}$

N_{2}

P_{4}

P_{2}

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