Alkenes and Alkynes (Double and Triple Bonds)

- Carbon can form double and triple bonds with Carbon atoms
- When multiple bonds form fewer hydrogen are attached to the Carbon atom
- The naming rules are almost the same as the Alkanes
     - The position of the double/triple bonds always has the lowest number and its put in front of the parent chain.

Eg.  4 Butene
       1 Octene

- Double bonds (Alkenes) end in -ene
- Triple bonds (Alkynes) end in -yne

"Trans" and "Cis" Butene

- If two adjacent carbons are bonded by a double bond and have side chains on them two possible compounds are possible.


Eg.


H3C                                          CH3
         \                                     /
               C          =            C
             /                          \
         H                                H

Cis 2 Butene



H                           CH3
    \                         /
         C     =    C
       /                  \
  H3C                 H


Trans 2 Butene


Multiple Double Bonds

-More than one double bond can exist in a molecule
- Use the same multiplier inside the parent chain




               H              H
      H  -  C  =  C  -  C  =  C  -  H
                                         H

1,3 Butadiene




- Meldrick Mendoza


P.S. Dogane takes to long Mr. Doktor. =D