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JEE Advanced levelSingle correct optionDifficulty 3 of 3cb148

The highest occupied molecular orbitals (HOMO) of $N X_{2}$ and $O X_{2}$ respectively are

A $σ 2 p_{z}$ and $π^{*} 2 p$
B $σ 2 p_{z}$ and $σ^{*} 2 p_{z}$
C $π 2 p$ and $π^{*} 2 p$
D $π^{*} 2 p$ and $σ 2 p_{z}$

Answer: A

For

N X_{2}

(10 valence electrons, with 2s-2p mixing) the last two electrons fill

σ 2 p_{z}

, which lies above

π 2 p

. For

O X_{2}

(12 electrons) the last two electrons occupy the degenerate

π^{*} 2 p_{x}

and

π^{*} 2 p_{y}

.

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