Alkenes
Chapter Name : Hydrocarbons |
Sub Topic Code : 102_11_13_03_02 |
Topic Name : Alkenes |
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Sub Topic Name : Nomenclature |
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Introduction
The parent structure is the longest chain containing both carbon atoms of the double bond. The two carbon atoms of a double bond and the four atoms attached to them lie in a plane, with bond angles of approximately 120°.
Pre-Requisites:
Alkenes
Activity:
Skeleton.
Real Life Question:
What are alkenes?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| unsaturated hydrocarbons | Hydrocarbons that have double or triple covalent bonds between adjacent carbon atoms. Those with at least one double bond are called alkenes and those with at least one triple bond are called alkynes. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Azo compounds | Compounds bearing the functional group R-N=N-R', in which R and R' can be either aryl or alkyl. |
Real life uses :
Alkenes are used for artificial ripening of fruits, as a general anesthetic, for making poisonous mustard gas (War gas) and ethylene-oxygen flame.
Places to visit :
Chemistry laboratory.
Practical examples around us
| Examples | Explainations |
|---|---|
| Ethylene | A hydrocarbon with the formula C2H4 or H2C=CH2. It is a colorless flammable gas with a faint "sweet and musky" odor when pure. It is the simplest alkene (a hydrocarbon with carbon-carbon double bonds), and the simplest unsaturated hydrocarbon after acetylene (C2H2). |
What you learn in Theory:
Alkenes are named by dropping the -ane ending of the parent and adding -ene. The parent structure is the longest chain containing both carbon atoms of the double bond.
What you learn in Practice:
Find the Longest Carbon Chain that Contains the Carbon Carbon double bond. If you have two ties for longest Carbon chain, and both chains contain a Carbon Carbon double bond, then identify the most substituted chain.