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NEET levelSingle correct optionDifficulty 1 of 3cc176

In a metal carbonyl, compared with free $CO$ , the carbon-oxygen bond is:

Aconverted into a C-O single bond
Blonger and weaker, because $π^{*}$ orbitals gain electron density
Cunchanged, because CO acts only as a $σ$ donor
Dshorter and stronger, because $σ$ donation removes antibonding electrons

Answer: B

Back-donation puts electron density from the metal into the antibonding

π^{*}

orbitals of

CO

. This lowers the C-O bond order, so the bond becomes longer and weaker, and its stretching frequency falls below that of free

CO

(

2143 c m^{- 1}

).

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