Final answer:
According to valence bond theory, the orbitals that overlap in the formation of the bond in ClF are 3p on Cl and 2p on F.
Step-by-step explanation:
According to valence bond theory, a covalent bond is formed when two atomic orbitals on different atoms overlap. The orbitals that overlap in the formation of the bond in ClF are 3p on Cl and 2p on F. This overlap allows the single electrons in each orbital to combine and form an electron pair, creating a covalent bond.