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Level 1-Alkanes   Level 2-Alkenes  Level 3 Alkynes  Level 4 Benzenes   Level 5 Dienes  Level 6 Trienes   Level 7 Cyclic Compounds

 

Level 2-Naming Alkenes

 

 

Alkenes- Are unsaturated (not all single bonds) hydrocarbons (hydrogen and carbon only) containing 1 carbon to carbon double bond "C=C".

The rule for naming is they all end with "-ene".

The general formula is CnH2n, n is the number of carbons is used to determine the number of hydrogen atoms. Example n=5, so H=(2(5))=10

C5H10

TEST Question-What is the minimum number of carbons that are required to have an alkene?

Since is no such molecule as methene!!! You need at least 2 carbons to have a double bond.

Alkenes are ISOMERs of Cyclic Compounds. They have the same general formula.

Naming Compounds- Again, ignore all the hydrogen's. We only worry about carbon atoms.

Rule #1-Name the longest chain with the double bond. It is not always the longest chain of carbons. End it with "-ene".

Does Not Exist Methene
C2H4 ethene
C3H6 propene

Rule #2-When necessary use the lowest number to give the location of double bond in the longest chain.

C4H8 1-butene
C4H8 2-butene
C4H8 2-butene

 

C5H10 1-pentene
C5H10 2-pentene
C5H10 3-methyl-1-butene
C5H10 2-methyl-1-butene
C5H10 2-methyl-2-butene
C5H11 2,2-dimethyl propene

FYI-2,2-dimethyl propene does not exist

C5H10 it has 5 bonds on the center carbon. It is only allowed 4.

Level 1-Alkanes   Level 2-Alkenes  Level 3 Alkynes  Level 4 Benzenes   Level 5 Dienes  Level 6 Trienes   Level 7 Cyclic Compounds

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