Which molecule/ion among the following cannot act as a ligand in complex compound?

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${CN}^{-}$

${CH}_{4}$

${Br}^{-}$

answer is C.

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Detailed Solution

${CH}_{4}$ cannot act as a ligand as it contains no lone pair(s) of electrons. Methane ${CH}_{4}$ cannot act as a ligand in complex compounds as all electrons in it are paired. There is no lone pair of electrons or pi electrons which can be donated to metal to form a bond.

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