Carbon and silicon belong to group `IV`. The maximum coordination number of carbon in commonly occuring compounds is four whereas that of silicon is six. This is due to

Options

A. large size of silicon.
B. more electropositive nature of silicon.
C. ailability of d-orbitals in silicon.
D. both (a) and (b).

Answer

C

Explanation

Due to non-availability of vacant d-orbitals, it cannot exceed its coordination number more than four. Thus carbon never forms complexes e.g., `[CCl_(6)]^(2-)` does not exist but `[SiCl_(6)]^(2-)` exists.