Alkenes
Chapter Name : Hydrocarbons |
Sub Topic Code : 102_11_13_03_05 |
Topic Name : Alkenes |
|
Sub Topic Name : Physical Properties |
|
Introduction
In organic chemistry, an alkene is an unsaturated chemical compound containing at least one carbon–carbon double bond. The simplest acyclic alkenes, with only one double bond and no other functional groups, known as mono-enes, form a homologous series of hydrocarbons with the general formula CnH2n.
Pre-Requisites:
Alkenes
Activity:
Raincoats.
Real Life Question:
What are alkenes?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| alkenes | An alkene is a hydrocarbon containing a double carbon-carbon bond. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| ethylene | Ethylene glycol is produced from ethylene, via the intermediate ethylene oxide. Ethylene oxide reacts with water to produce ethylene glycol. |
Real life uses :
Making industrial ethanol and further oxidation to ethanoic acid.
Places to visit :
Chemistry laboratory.
Practical examples around us
| Examples | Explainations |
|---|---|
| Propene | Propene, also known as propylene or methyl ethylene, is an unsaturated organic compound having the chemical formula C3H6. It has one double bond, and is the second simplest member of the alkene class of hydrocarbons. |
What you learn in Theory:
The main differences between the two are that the acidity levels of alkenes are much higher than the ones in alkanes. The physical state depends on molecular mass. The simplest alkenes, ethene, propene and butane are gases. Linear alkenes of approximately five to sixteen carbons are liquids, and higher alkenes are waxy solids.
What you learn in Practice:
Like single covalent bonds, double bonds can be described in terms of overlapping atomic orbitals, except that, unlike a single bond (which consists of a single sigma bond), a carbon–carbon double bond consists of one sigma bond and one pi bond.