Question
Cyclodecene can exist in both cis and trans forms, but cyclohexene cannot. Explain.
Step 1
Cycloalkenes are cyclic hydrocarbons with at least one double bond in the ring. The double bond introduces geometric isomerism possibilities, where the substituents around the double bond can be on the same side (cis) or on opposite sides (trans). Show more…
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Cyclodecene can exist in both cis and trans forms, but cyclohexene cannot. Explain. (Making molecular models is helpful.)
Cyclohexene exists only in the cis form, while cyclodecene exists in both the cis and trans forms. Explain. (Hint: Molecular models are helpful for this problem.)
Why do you suppose small-ring cycloalkenes like cyclohexene do not exist as cis-trans isomers, whereas large ring cycloalkenes like cyclodecene do show isomerism?
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