Which of the following diatomic molecular species has only $π$ bonds according to Molecular Orbital Theory?

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${Be}_{2}$

$O_{2}$

$N_{2}$

$C_{2}$

answer is D.

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Detailed Solution

$B e_{2} (8) : K K σ {(2 s)}^{2} σ^{*} {(2 s)}^{2}$

$O_{2} (16) : K K σ (2 s^{2}) σ^{*} (2 s^{2}) σ {(2 p_{z})}^{2} π {(2 p_{x})}^{2} π {(2 p_{y})}^{2} π^{*} {(2 p_{x})}^{1} π^{*} {(2 p_{y})}^{1}$

$N_{2} (14) : K K σ {(2 s)}^{2} σ^{*} {(2 s)}^{2} π {(2 p_{x})}^{2} π {(2 p_{y})}^{2} σ {(2 p_{z})}^{2}$

$C_{2} (12) : K K σ {(2 s)}^{2} σ^{*} {(2 s)}^{2} π {(2 p_{x})}^{2} π {(2 p_{y})}^{2}$

Therefore, $C_{2}$ contains $2 π$ bonds as it has 4 electrons in two pi-molecular orbitals

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