Who can help me to explain why cyclodecene can exist in both cis and trans forms, but cyclohexene cannot.

Question

anonymous · Answer

cyclohexane has only 120 degree angles, but cyclodecene has 120 and 240 degree angles. If the double bond falls on the 240 degree angle, it will be trans.

anonymous · Answer

why cyclodecene has 120 and 240 degree angles?  not just 240 degree angles?

anonymous · Answer

but as your explain, cyclodecene cannot form cis forms, oppositing to the problem itself.

anonymous · Answer

draw me a picture please?

anonymous · Answer

http://www.pherobase.com/pherobase/gif/Z-cyclodecene.GIF (cyclodecene) http://img1.guidechem.com/chem/e/dict/90/2198-20-1.jpg (cyclodecene) http://upload.wikimedia.org/wikipedia/commons/0/08/Cyclohexene.png (cyclohexene)