The basic character of transition metal monoxides follows the order:

Step-by-step solution

For transition metal oxides in the same oxidation state, the basic character decreases as we move from left to right across a period. This occurs because the effective nuclear charge increases and the ionic radius of the metal ion decreases ( Ti²⁺ > V²⁺ > Cr²⁺ > Fe²⁺ ). The decrease in size increases the polarizing power of the cation, leading to an increase in the covalent character of the metal-oxygen bond and a corresponding decrease in the basic character. The atomic numbers of the given metals are Ti ( 22 ), V