Which of the following pairs represent the same molecule ?
(A) and
(B) and
(C) and
(D) and

Question

Which of the following pairs represent the same molecule ? (A) and (B) and (C) and (D) and

TestHub · Accepted Answer

In benzene (A, D) the two Kekulé structures are resonance forms of one delocalised molecule, so each pair is the same compound. In cyclobutadiene (B) the double bonds are localised (rectangular), so a D-D pair on a C = C bond and on a C-C bond are different compounds. In cyclooctatetraene (C) the ring is tub shaped with fixed double bonds, so the two forms are different isomers. Same molecules : A and D.

Chemistry - GOC Question with Solution | TestHub

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