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JEE Advanced levelSingle correct optionDifficulty 3 of 3cb146

The number of electrons in $O X_{2}$ (valence shell only) that occupy molecular orbitals possessing a nodal plane that contains the internuclear axis is

A4
B8
C6
D10

Answer: C

Only

π

and

π^{*}

orbitals have a nodal plane containing the axis. In

O X_{2}

, the

π 2 p_{x}, π 2 p_{y}

pair holds 4 electrons and

π^{*} 2 p_{x}, π^{*} 2 p_{y}

hold 2. Total

= 4 + 2 = 6

. The

σ

and

σ^{*}

orbitals have no such plane.

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