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Which of the following is correct about the following compound?

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$C_{1} - C_{2}$ bond length is shorter than $C_{2} - C_{3}$ bond length

$C_{1} - C_{2}$ bond length is greater than $C_{2} - C_{3}$ bond length

All the $C - C$ bond length are same

All the $C - C$ bond length are equal to $C - C$ bond length of benzene

answer is B.

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Detailed Solution

$C_{1} - C_{2}$ - is shorter because it is double bond in two of three resonance structure; $C_{2} - C_{3}$ is a single bond in two of three resonance structures.

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