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

Chemistry - GOC Question with Solution | TestHub

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