where k denotes the exchange integral, favours ferromagnetic coupling. The fraction on right hand side favours antiferromagnetic coupling. In this approach, coupling is described as arising from two magnetic MOs localized on two spin centers, which combine to a bonding and antibonding MO with energies ϵ 1 and ϵ 2 in triplet state. j 0 -j is the difference between Coulomb integrals for the two electrons in same magnetic orbitals v/s one electron in each of the magnetic orbital. Yet, other effects such as spin-polarization are relevant in driving the exchange coupling between the spin centers. However, the pair of orbitals involved in the description of spin coupling and conductance remains the same, i.e. magnetic singly occupied MOs. Apart from the smaller energy gap between the magnetic MOs, the delocalization of these orbitals play a significant role. The delocalized nature of SOMOs promote stronger exchange couplings, while the coefficients of the SOMOs on the connecting sites plays a major role in driving a junction towards higher conductance. Herein, the proposed di-and tri-radical junctions represents highly sought after systems with co-existing ferromagnetic couplings, spin-polarized transmission and high conductance featured with Fano resonances.