Editing Alkene (section)

=== Combustion ===
Like most other [[hydrocarbon]]s, alkenes [[combustion|combust]] to give carbon dioxide and water.

The combustion of alkenes release less energy than burning same [[molarity]] of saturated ones with same number of carbons. 
This trend can be clearly seen in the list of [[enthalpy of combustion|standard enthalpy of combustion]] of hydrocarbons.<ref>{{cite web|url=http://www2.ucdsb.on.ca/tiss/stretton/database/organic_thermo.htm|title=Organic Compounds: Physical and Thermochemical Data|website=ucdsb.on.ca|access-date=May 5, 2019}}</ref>
{| class="wikitable"
|+Combustion energies of various hydrocarbons
!Number of<br>carbons
!Substance
!Type
!Formula
!H<sub>c</sub><sup>ø</sup><br>(kJ/mol)
|-
| rowspan="3" |2
|[[ethane]]
|saturated
|C<sub>2</sub>H<sub>6</sub>
| −1559.7
|-
|[[ethylene]]
|unsaturated
|C<sub>2</sub>H<sub>4</sub>
| −1410.8
|-
|[[acetylene]]
|unsaturated
|C<sub>2</sub>H<sub>2</sub>
| −1300.8
|-
| rowspan="3" |3
|[[propane]]
|saturated
|CH<sub>3</sub>CH<sub>2</sub>CH<sub>3</sub>
| −2219.2
|-
|[[propene]]
|unsaturated
|CH<sub>3</sub>CH=CH<sub>2</sub>
| −2058.1
|-
|[[propyne]]
|unsaturated
|CH<sub>3</sub>C≡CH
| −1938.7
|-
| rowspan="3" |4
|[[butane]]
|saturated
|CH<sub>3</sub>CH<sub>2</sub>CH<sub>2</sub>CH<sub>3</sub>
| −2876.5
|-
|[[1-butene]]
|unsaturated
|CH<sub>2</sub>=CH−CH<sub>2</sub>CH<sub>3</sub>
| −2716.8
|-
|[[1-butyne]]
|unsaturated
|CH≡C-CH<sub>2</sub>CH<sub>3</sub>
| −2596.6
|}