What is the name of these?

Question

1. [Zn(NH3)4]2

2. [Cr(NH3)4Br2]

3. cis-[Co(en)2(NO2)2]

4. NaBrF4

Answer 1

1. bis-tetraamminezinc

2. tetraamminedibromochromium (II)

3. cis-diethylenediaminedinitritocobalt (II) or cis-diethylenediaminedinitrocobalt (II) (depending whether the ligand is bound by the oxygen or nitrogen)

4. sodium tetrafluorobromate