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Which of the following species is not expected to be a ligand?

(i) \text {NO}

(ii) \text {NH}_{4}^{+}

(iii) \text {NH}_{2}\text {CH}_{2}\text {CH}_{2}\text {NH}_{2}

(iv) \text {CO}

Answers (1)

Option (ii) is the correct answer.

Explanation: To form M-L bonds, the ligand must donate a pair of electrons or any loosely held electron pair to the metal.

e. g

Among all \text {NH}_{4}^{+} does not have any pair of electrons.

Hence \text {NH}_{4}^{+} is not a ligand.

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