A) a double bond between C and O atoms.
B) a triple bond between C and O atoms.
C) a lone pair of electrons on the C atom
D) two lone pairs of electrons on the O atom.
Correct Answer: C
Solution :Carbon monoxide has the structure; \[:C=O:\] If forms metal-carbon bond and thus donate its lone pair on carbon to metal in metal carbonyls and behaves as a Lewis base.
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