(i) n=4,l=1⇒4 p-orbital(ii) n=4,l=0⇒4s-orbital(iii) n=3,l=2⇒3d-orbital(iv) n=3,l=1⇒3d-orbitalAccording to Aufbau principle, energies of above-mentioned orbitals are in the order of(iv) 3p< (ii) 4s< (iii) 3d< (i) 4p