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Resonance

In phosgene, ...

Question

In phosgene, $C - O$ bond length is longer than expected but $C - C l$ bond length is shorter than expected. This is due to ____.

inductive effect

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resonance effect

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electronegativity effect

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none of the above

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Solution

The correct option is B resonance effect
In phosgene CO bond length is longer than expected but CCl bond length is shorter than expected. This is due to resonance.
In the following resonance structures, it can be seen that in two out of three resonance structures, C-O single bond is present. Hence, CO bond length is longer than expected. Also in one of the resonance structures, C=Cl double bond is present. Hence, CCl bond length is shorter than expected.

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