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Question


Which of the following statement is correct for the given structure?

A
In the dianion, all the CC bond lengths are not of same length
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B
In the dianion, all the CC bonds are of same length but CO bonds are of different length
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C
In the dianion, all the CC bond are of same length and also all CO bonds are of same length
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D
None of the above
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Solution

The correct option is C In the dianion, all the CC bond are of same length and also all CO bonds are of same length
The resonance structures of the given dianion are given as follows:

Due to the presence of resonance, all the CC and CO bonds in the given dianion are equivalent and hence all the CC bonds are of the same length and also all the CO bonds are of the same length.
Hence, the correct answer is option B.

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