Identify the set which does not have ambidentate ligand (s)

• A

  $\mathrm{NO}_2^{-}, \mathrm{CN}^{-}, \mathrm{C}_2 \mathrm{O}_4^{2-}$
• Correct answer
  B

  $\mathrm{C}_2 \mathrm{O}_4^{2-}, \mathrm{H}_2 \mathrm{O}, \mathrm{SO}_4^{2-}$
• C

  $\mathrm{SCN}^{-}, \mathrm{NH}_3, \mathrm{CH}_3 \mathrm{COO}^{-}$
• D

  $\mathrm{CN}^{-}, \mathrm{SCN}^{-}, \mathrm{CH}_3 \mathrm{NH}_2$

Hence, the correct answer is option: 'B'.