1. Alkene - Alkyne

2. C11-5-14 NAMING AND DRAWING Vocabulary & Concepts OUTCOME QUESTION(S):
Name and draw structural models of simple and
branched alkanes.
Include: complete structural formula, molecular
formula, general formula, isomers
branched alkenes and alkynes.
Compare and contrast the structure and uses of aromatic
and aliphatic hydrocarbons.
Vocabulary & Concepts

3. Remember what we know of double and triple bonds:
Double bonds
C = C H C H
Triple bonds C H
C ≡ C H
Both considered unsaturated

4. Always show the double bond in the condensed formula
Alkenes
Suffix ene
General formula – CnH2n
Always show the double bond in the condensed formula
Decene
C10H20
Methene
Ethene
Propene
Butene
Pentene
Hexene
Heptene
Octene
Nonene
Not possible…
CH2=CH2
CH2=CHCH3
CH2=CHCH2CH3
CH2=CHCH2CH2CH3
CH2=CHCH2CH2CH2CH3
CH2=CHCH2CH2CH2CH2CH3
CH2=CHCH2CH2CH2CH2CH2CH3
C9H18
CnH2n
n = 10
2n = 2(10) = 20

5. C C - C = C - C - C - C Naming Alkenes and Alkynes 5- methyl hex-2-ene
Find the parent chain that has the double/triple bond.
Find the location of the bond by numbering carbons from the end that gives the lowest number to the bond.
Show the location of the bond with a hyphen in the parent name
Branches named as per the rules for an alkane
The double bond is the MOST important thing – number the carbons with that in mind
C - C = C - C - C - C C 5-
methyl
hex-2-ene 1 6 2 5 4 3 3 4 2 5 6 1

6. Lowest number to the double bond
Draw the structure of 4-methylpent-2-ene. C H3
C – C = C – C – C H3 H H H H3 1 2 3 4 5
Name the following structure.
Lowest number to the double bond
CH3CH2CH(CH3)CH=C(C2H5)CH2CH3 7 6 5 4 3 2 1 3-
ethyl- 5-
methyl
hept-3-ene

7. Draw it out first if you need to…
Draw a condensed formula for 2,5,5-trimethylhex-2-ene.
Draw it out first if you need to… C H3 C H3
C – C = C – C – C – C H3 H H2 H3 1 2 3 4 5 6 C H3
CH3C(CH3)=CHCH2C(CH3)2CH3 1 2 3 4 5 6
2,5,5-trimethylhex-2-ene

8. Be careful when adding the hydrogens
Alkynes
Suffix yne
General formula – CnH2n-2
Be careful when adding the hydrogens
Decyne
C10H18
Methyne
Ethyne
Propyne
Butyne
Pentyne
Hexyne
Heptyne
Octyne
Nonyne
Not possible…
CH≡CH
CH≡CCH3
CH≡CCH2CH3
CH≡CCH2CH2CH3
CH≡CCH2CH2CH2CH3
CH≡CCH2CH2CH2CH2CH3
CH≡CCH2CH2CH2CH2CH2CH3
C9H16
CnH2n-2
n = 10
2n = 2(10)-2 = 18

9. 2,2,5,5-tetramethylhex-3-yne
Draw a structural of 2,2,5,5-tetramethyhex-3-yne. C H3 C H3
C – C – C ≡ C – C – C H3 H3 1 2 3 4 5 6 C C H3 H3
2,2,5,5-tetramethylhex-3-yne

10. If the location of the bond is not shown – assume it is off carbon #1
Like Alkyl groups (trimethyl), prefixes and numbers must be used to indicate multiple double or triple bonds.
C = C – C = C
Buta-1,3-diene 1 2 3 4
C ≡ C – C – C ≡ C C
3-methylpenta-1,4-diyne 1 2 3 4 5
If the location of the bond is not shown – assume it is off carbon #1

11. This is messed up…just showing the possibilities (fun, right?)
Name the condensed formula below:
HC≡CC=(C2H5)C=CH(CH3)CH(CH3)CH3 1 2 3 4 5 6 7 C H3 H2 C H3 H
C ≡ C – C = C = C – C – C H H3 1 2 3 4 5 6 7 C H3 3-
ethyl-
5,6-
dimethyl
hept-3,4-dien-1-yne
This is messed up…just showing the possibilities (fun, right?)

12. C11-5-14 NAMING AND DRAWING Vocabulary & Concepts CAN YOU / HAVE YOU?
Name and draw structural models of simple and
branched alkanes.
Include: complete structural formula, molecular
formula, general formula, isomers
branched alkenes and alkynes.
Compare and contrast the structure and uses of aromatic
and aliphatic hydrocarbons.
Vocabulary & Concepts