The set which does not have ambidentate ligand(s) is :
$\mathrm{C}_{2} \mathrm{O}_{4}{ }^{2-}, \mathrm{NO}_{2}{ }^{-}, \mathrm{NCS}^{-}$
$\mathrm{C}_{2} \mathrm{O}_{4}{ }^{2-}$, ethylene diammine, $\mathrm{H}_{2} \mathrm{O}$
$\mathrm{NO}_{2}^{-}, \mathrm{C}_{2} \mathrm{O}_{4}{ }^{2-}$, EDTA $^{4-}$
$\mathrm{EDTA}^{4-}, \mathrm{NCS}^{-}, \mathrm{C}_{2} \mathrm{O}_{4}{ }^{2-}$
