Which of the following diatomic molecular species has only bonds according to Molecular Orbital Theory? [2019]

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Solution

Q.
Which of the following diatomic molecular species has only $π$ bonds according to Molecular Orbital Theory [2019]

1 ${Be}_{2}$

2 $O_{2}$

3 $N_{2}$

4 $C_{2}$

Ans.
(4)

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

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

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

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

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

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