Which of the following can be described as trans isomers?

Question

Quizplus · Accepted Answer

Trans isomers refer to isomers in which the substituents are on opposite sides of a double bond or ring. In option I, the substituents are on the same side of the ring, so it can't be a trans isomer. Option II has one trans isomer (the two methyls are on opposite sides), but the other isomer has the two methyls on the same side, so it's not a trans isomer. Option III has two trans isomers (the two methyls are on opposite sides in both cases). Option IV also has two trans isomers (the two chloride atoms are on opposite sides in both cases). Option V has one trans isomer (the two ethyl groups are on opposite sides), but the other isomer does not have a double bond, so it can't be a trans isomer. Therefore, the correct answer is C.

Which of the Following Can Be Described as Trans Isomers