Answer: A. 4, since all 4 ligands (2 H2O&2Br) are monodentate hence 4x1=4
B. 4, (4x1=4)
C. 4(4x1=4)
D. 4(4x1=4)
E. 6(6x1=6)
F. 6(2(2)+2(1)=4+2=6) en is bidentate ligand
Explanation:
Coordination number is equal to number of ligands surrounded the metal atom.
Coordination number= No of ligands X denticity
Denticity is nothing but nature of ligands like mono, bi dentate, or tetrads rate etc.