Solved: CHEMISTRY Question for NEET

NEET CHEMISTRYMedium

Which one of the following statements is incorrect related to Molecular Orbital Theory?

The $\pi^*$ antibonding molecular orbital has a node between the nuclei.

In the formation of a bonding molecular orbital, the two electron waves of the bonding atoms reinforce each other.

Molecular orbitals obtained from $2p_x$ and $2p_y$ orbitals are symmetrical around the bond axis.

A $\pi$ -bonding molecular orbital has larger electron density above and below the internuclear axis.

Symmetry of Molecular Orbitals: According to NCERT, sigma ( $\sigma$ ) molecular orbitals are symmetrical around the bond-axis, while \pi ( $\pi$ ) molecular orbitals are not symmetrical .
Formation of Pi Orbitals: Molecular orbitals obtained from the linear combination of $2p_x$ and $2p_y$ orbitals (assuming z-axis is the internuclear axis) are of the $\pi$ type. These orbitals consist of positive lobes above and negative lobes below the molecular plane, making them unsymmetrical with respect to rotation around the bond axis .
Analysis of other options:

Option A: The $\pi^*$ antibonding MO has a node between the nuclei (zero electron density) . (Correct Statement)
Option B: Bonding MOs are formed by constructive interference where electron waves reinforce each other . (Correct Statement)
Option D: A $\pi$ bonding MO has electron density concentrated above and below the internuclear axis . (Correct Statement)

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