MHTCET 16 Apr 2026 Shift 1 Paper

Concept:A molecule is paramagnetic when it has one or more unpaired electrons in its molecular orbitals.Explanation:Using Molecular Orbital Theory, we check the electron configuration of each molecule.For $\mathrm{Li}_{2}$, all electrons are paired, so it is diamagnetic.For $\mathrm{N}_{2}$, all electrons are paired, so it is diamagnetic.For $\mathrm{O}_{2}$, there are two unpaired electrons present in the antibonding $\pi^{*} 2p$ orbitals, making it paramagnetic.For $\mathrm{F}_{2}$, all electrons are paired, so it is diamagnetic.Therefore, among the given options, only $\mathrm{O}_{2}$ shows paramagnetism.Answer:Option C: $\mathrm{O}_{2}$