presence of \(N O_{2}^{-}\)
The isomers are \(\left[ Cr \left( NH _{3}\right)_{5}\left( NO _{2}\right)\right]^{2+}\) and \(\left[ Cr \left( NH _{3}\right)_{5}( ONO )\right]^{2+}\)
$(1) $ $[Ag(NH_3)_2]^{+}$ - રેખીય
$ (2) $ $[MnCl^4]^{2-}$ - ચતુષ્ફલકીય
$(3) $ $[Cu(NH_3)_4]^{2+}$ - ચોરસ સમતલ
$(4) $ $[Ni(CN)_4]^{2-}$ - ચોરસ સમતલ
$(A)\,\,\,\,[Ni(H_2O)_5NH_3]^{2+},$
$(B)\,\,\,\,[Ni(H_2O)_4(NH_3)_2]^{2+}$
$(C)\,\,\,\,[Ni(H_2O)_3(NH_3)_3]^{2+}$
(Atomic nos. $Mn = 25,\,Fe = 26,\,Co = 27$)