Which of the following statements about cis-trans isomers are correct ?
(1) The trans isomer generally has a higher melting point than the cis isomer.
(2) Cis and trans isomers have the same molecular formula.
(3) All alkenes exhibit cis-trans isomerism.
(4) The cis isomer is always more stable than the trans isomer.

Question

Which of the following statements about cis-trans isomers are correct ?

(1) The trans isomer generally has a higher melting point than the cis isomer.

(2) Cis and trans isomers have the same molecular formula.

(3) All alkenes exhibit cis-trans isomerism.

(4) The cis isomer is always more stable than the trans isomer.

TestHub · Accepted Answer

Ans. (A). (1) True : the more symmetric trans isomer packs better into a crystal lattice and generally melts higher. (2) True : cis-trans isomers differ only in spatial arrangement. (3) False : alkenes with two identical groups on one double-bond carbon cannot show cis-trans isomerism. (4) False : the trans isomer is usually more stable (less steric strain).

Chemistry - STEREO ISOMERISM Question with Solution | TestHub

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