Assertion: Transition metals forms a large number of complex compounds.

Reason: Formation of complex compounds is due to the d-d transition and polarisation.

Assertion is correct statement but reason is wrong statement.

Transition metals forms a large number of complex compounds. The tendency to form complex is due to the following reasons:

(i) The presence of vacant orbitals which can accept one or more electron pairs from ligands.

(ii) Higher charge density due to small size and high charge on the transition metal ion.

(iii) Possibility of several oxidation states.