Chemistry - CHEMICAL BONDING Question with Solution | TestHub

Statement (A) is incorrect: KO₂ contains the superoxide ion (O₂⁻), which has one unpaired electron in its antibonding molecular orbital; hence, it is paramagnetic and weakly attracted (not repelled) by a magnetic field.

Statement (B) is correct: Al₂(CH₃)₆ has a dimeric structure containing two $3c-2e^{-}$ (three-center two-electron) bridge bonds (Al—C—Al) and four terminal $2c-2e^{-}$ bonds.

Statement (C) is incorrect: In N(SiH₃)₃, the lone pair on the nitrogen atom undergoes significant $p\pi -d\pi$ back-bonding into the vacant d-orbitals of silicon, giving it a planar geometry and sp² hybridization.

Statement (D) is correct: The Highest Occupied Molecular Orbital (HOMO) of N₂ is the ${\sigma }_{2pz}$ bonding orbital, which is symmetric with respect to the center of inversion and therefore has gerade symmetry.