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Which of the following has a lower stretching frequency for $C - O$ a bond?

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${[Mn (CO)_{6}]}^{4}$

Both have an equal stretching frequency

${[V (CO)_{6}]}^{-}$

None of these

answer is B.

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Detailed Solution

${[Mn (CO)_{6}]}^{+}$ has lower stretching frequency for $C - O$ bond.

The metal has a positive charge, which favors the process of back donating.

The electrons from the metal fill the π− antibonding orbital of CO, they weaken the carbon-oxygen bond.

Hence, option A is correct.

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