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Which of the following increasing order of energy of molecular orbitals is correct for $O_{2}, F_{2} and {Ne}_{2} ?$

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$σ 1 s, σ * 1 s, σ 2 s, σ * 2 s, σ 2 p_{z}, π 2 p_{x} = π 2 p_{y}, π * 2 p_{x} = π * 2 p_{y}, σ * 2 p_{z}$

$σ 1 s, σ * 1 s, σ 2 s, σ * 2 s, π 2 p_{x} = π 2 p_{y}, σ 2 p_{z}, π * 2 p_{x} = π * 2 p_{y}, σ * 2 p_{z}$

$σ 1 s, σ * 1 s, σ 2 s, σ 2 p_{z}, σ * 2 s, π 2 p_{x} = π 2 p_{y}, π * 2 p_{x} = π * 2 p_{y}, σ * 2 p_{z}$

$σ 1 s, σ * 1 s, σ 2 s, σ 2 p_{z}, π 2 p_{x} = π 2 p_{y}, σ * 2 s, π * 2 p_{x} = π * 2 p_{y}, σ * 2 p_{z}$

answer is A.

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Detailed Solution

For molecules with more than 14 electrons the order is $σ 1 S σ^{*} 1 S σ 2 S σ^{*} 2 S σ 2 P_{Z} π 2 P_{X} = π 2 {P_{Y} π^{*} 2 P_{X =} π}^{*} 2 P_{Y} σ^{*} 2 P_{Z}$

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