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Q.

Which molecule \ion among the following cannot act as a ligand in complex compounds?

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a

${CN}^{-}$

b

${CH}_{4}$

c

${Br}^{-}$

d

$CO$

answer is A.

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Detailed Solution

Since all of the electronsin methane ${CH}_{4}$ are coupled and no metal can accept a lone pair of electrons or a pi electron to form a connection it cannot act as a ligand in complex compounds

So, the correct option is A.

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