AIIMS 2018 Chemistry Orbital Mixing MCQ Question

In the context of molecular orbital theory, when s and p orbitals mix to form bonding and antibonding molecular orbitals (MOs), the bonding molecular orbital (BMO) does indeed contain a nodal plane, which is a region of zero electron density, typically found in the antibonding molecular orbital (ABMO). Therefore, stating that a nodal plane is absent in the BMO is incorrect.

Option A is correct because the ABMO has a nodal plane, while option C is true as MOs can have energies higher than the parent atomic orbitals (AOs) due to antibonding interactions. Option D is also accurate since MOs formed from the mixing of s and p orbitals can exhibit asymmetry depending on the orientation and phase of the contributing orbitals.