Which of the following statements are correct ?
(1) All alkenes show geometrical isomerism.
(2) Geometrical isomers have the same molecular formula.
(3) Cis-trans isomers can be optically active.

Question

Which of the following statements are correct ? (1) All alkenes show geometrical isomerism. (2) Geometrical isomers have the same molecular formula. (3) Cis-trans isomers can be optically active.

TestHub · Accepted Answer

(1) is false : only alkenes with two different groups on each double-bond carbon show geometrical isomerism. (2) is true : cis-trans isomers differ only in spatial arrangement, so the molecular formula is the same. (3) is true : for example trans-1,2-dimethylcyclopropane is chiral, so a cis-trans pair can contain optically active members.

Ans. (2) and (3) only

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