In the following question, an Assertion (A) is followed by a corresponding Reason (R). Use the following keys to choose the appropriate answer. Assertion : Fluorine molecule has bond order one. Reason : The number of electrons in the antibonding molecular orbitals is two less than that in bonding molecular orbitals.

Atomic orbitals are the regions around the nuclei where probability of finding the electrons is high. In LCAO M.O. theory, atomic orbitals of the combining atoms get mixed and rearrange themselves to form molecular orbitals. Two atomic orbitals can overlap to form two molecular orbitals, one of which lies at a lower energy level, called bonding molecular orbital (BMO) and the other at a higher energy level, called antibonding molecular orbitals (ABMO). The energy order of these M.Os. follows Aufbau principle. Each molecular orbital can hold one or two electrons in accordance with Pauli's exclusion principle. The bond order of a molecule or ion is half the number of bonding electrons minus the number of antibonding electrons. Molecular orbital theory can explain the bond length, bond dissociation energy, bond stability and paramagnetism/ diamagnetism of molecules. Which one of the following is paramagnetic and has bond order 1/2?

Atomic orbitals are the regions around the nuclei where probability of finding the electrons is high. In LCAO M.O. theory, atomic orbitals of the combining atoms get mixed and rearrange themselves to form molecular orbitals. Two atomic orbitals can overlap to form two molecular orbitals, one of which lies at a lower energy level, called bonding molecular orbital (BMO) and the other at a higher energy level, called antibonding molecular orbitals (ABMO). The energy order of these M.Os. follows Aufbau principle. Each molecular orbital can hold one or two electrons in accordance with Pauli's exclusion principle. The bond order of a molecule or ion is half the number of bonding electrons minus the number of antibonding electrons. Molecular orbital theory can explain the bond length, bond dissociation energy, bond stability and paramagnetism/ diamagnetism of molecules. During change of NO^+ to NO , the electron is added to: