Which of the following pairs of structures do | vedclass

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(A) Resonating structures must have the same number of atoms and the same arrangement of atoms; they only differ in the position of $\pi$-electrons or

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$A$

Vedclass · Answer

(A) Resonating structures must have the same number of atoms and the same arrangement of atoms; they only differ in the position of $\pi$-electrons or lone pairs.$(A)$ represents keto-enol tautomerism,where the position of an atom (hydrogen) changes. Thus,they are tautomers,not resonating structures.$(B)$ represents $1,3-$cyclohexadiene and $1,4-$cyclohexadiene. These are isomers with different positions of double bonds,but they are not resonating structures because the carbon skeleton connectivity is effectively different regarding the $\pi$-system.$(C)$ represents two Kekulé structures of benzene,which are valid resonating structures.Since both $(A)$ and $(B)$ do not represent resonating structures,the question implies identifying the pair that is not resonating. However,based on standard chemistry,both $(A)$ and $(B)$ are not resonating structures. Given the options,$(A)$ is a classic example of tautomerism.

Which of the following pairs of structures does not represent resonating structures?

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