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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 3-Naming Alkynes

 

 

Alkynes- Are unsaturated (not all single bonds) hydrocarbons (hydrogen and carbon only) containing 1 carbon to carbon triple bond "CC".

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

The general formula is CnH2n-2, n is the number of carbons is used to determine the number of hydrogen atoms. Example n=5, so H=(2(5)-2)=8

C5H8

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

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

 

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

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

Does Not Exist Methyne
C2H2 ethyne acetylene

 Fume Hood Explosion Acetylene

C3H4 propyne

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

C4H6 1-butyne
C4H6 2-butyne

 

C5H8 1-pentyne
C5H8 2-pentyne

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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