Thank you for reporting, we will resolve it shortly
Q.
The tetrahedral complexes have coordination number
J & K CETJ & K CET 2007Coordination Compounds
Solution:
The coordination number $(CN)$ of a metal atom in a complex is the total number of bonds formed by metal with ligands. In case of tetrahedral complexes the number of bonds formed between metal and ligand is four. So, coordination number is also four.