absorbed wave length order of $\lambda $ $Red > Green > Blue$ $L_3 > L_1 > L_2$
$\therefore $ Strength of ligand $\alpha \,\,\Delta \,\,\alpha \,\,1/\lambda$
$\therefore $ Strength of ligand $L_2 > L_1 > L_3$
($en=$ ઇથિલીન ડાય એમાઈન)
$(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