The cis-isomerism is shown by:
Correct answer: C. Option C: 2-butene (cis)
- A. Option A: 1-butene
- B. Option B: 2-butene (trans)
- C. Option C: 2-butene (cis)
- D. Option D: Cyclohexane
Explanation
In the context of alkenes, cis-isomerism occurs when two identical or similar groups are on the same side of a double bond. In 2-butene, the cis isomer has both methyl (CH3) groups on the same side of the double bond, which satisfies the condition for cis-isomerism. Option A, 1-butene, does not have the necessary arrangement of groups for cis-trans isomerism. Option B, 2-butene (trans), has the groups on opposite sides, which does not qualify as cis-isomerism. Option D, cyclohexane, is a saturated hydrocarbon without a double bond and therefore cannot show cis or trans isomerism.
This question appeared on the UHS MDCAT 2013 paper, which you can sit online with every answer explained.
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About Isomerism
Isomerism occurs when compounds have the same molecular formula but different atom arrangements or spatial orientations. The content includes chain, position, functional, metameric and tautomeric isomerism, along with geometrical and optical isomerism, including cis-trans forms, E/Z notation, chirality and enantiomers.
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