Which molecule/ion among the following cannot act as a ligand in complex compounds?
Show Hint
- \(\mathrm{CN^-}\)
- \(\mathrm{CH_4}\)
- CO
- \(\mathrm{Br^-}\)
The Correct Option is B
Solution and Explanation
\(\mathrm{CN^-}\) (lone pair on C), CO (lone pair on C, also a pi-acceptor) and \(\mathrm{Br^-}\) (lone pairs) are all common ligands.
\(\mathrm{CH_4}\) has only four C-H bonding pairs, no lone pair and no pi electrons, so it cannot donate electrons to a metal.
Answer: (2) \(\mathrm{CH_4}\)
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