Q57 / 200 · NEET 2023 (Manipur) · Chemistry

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

  • Correct answer
    A
    Molecular orbitals obtained from $2 \mathrm{p}_{\mathrm{x}}$ and $2 \mathrm{p}_{\mathrm{y}}$ orbitals are symmetrical around the bond axis.
  • B
    A $\pi$-bonding molecular orbital has larger electron density above and below the internuclear axis.
  • C
    The $\pi^*$ antibonding molecular orbital has a node between the nuclei.
  • D
    In the formation of bonding molecular orbital, the two electron waves of the bonding atoms reinforce each other.

Solution

- According to molecular orbital theory, the sigma $(\sigma)$ molecular orbitals are symmetrical around the bond-axis while pi $(\pi)$ molecular orbitals are not symmetrical. As $z$-axis is taken as internuclear axis, $2 p_x$ and $2 p_y$ forms $\pi$ molecular orbitals, hence these are unsymmetrical around the bond-axis

Hence, the correct answer is option: 'A'.

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