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NEET CHEMISTRYChemical Bonding and Molecular StructureMedium

Question

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

A

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

B

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

C

Molecular orbitals obtained from 2px2p_x and 2py2p_y orbitals are symmetrical around the bond axis.

D

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

Step-by-Step Solution

  1. Symmetry of Molecular Orbitals: According to NCERT, sigma (σ\sigma) molecular orbitals are symmetrical around the bond-axis, while \pi (π\pi) molecular orbitals are not symmetrical .
  2. Formation of Pi Orbitals: Molecular orbitals obtained from the linear combination of 2px2p_x and 2py2p_y orbitals (assuming z-axis is the internuclear axis) are of the π\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 .
  3. Analysis of other options:
  • Option A: The π∗\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 π\pi bonding MO has electron density concentrated above and below the internuclear axis . (Correct Statement)

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Chemical Bonding and Molecular Structure. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYChemical Bonding and Molecular Structurefollowingstatementsincorrectrelatedmolecular

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