When multiple bonds form fwer hydrogens are attached to the carbon atom.
Naming rules are almost the same as with alkanes.
-The positive of the double/triple bonds always has the lowest number and is put in front of the parent chain. (base chain)
Double bonds (Alkenes) end in -ene.
Triple bonds (Alkynes) end in -yne.
Trans & Cis Butene:
If two adjacent carbons are bonded by a double bond AND have side chains on them, two possible compounds are possible.
Trans 2 butene
Cis 2 butene
http://www.launc.tased.edu.au/online/sciences/PhysSci/pschem/carbon/ch3ch3/ene_yne.htm
http://library.thinkquest.org/3659/orgchem/alkenes-alkynes.html
-Candace Chan
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