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Subject - Organic Chemistry
The double bond, a special case of a, is formed from two electron pairs and consists of one σ and one π bond. The stronger σ bond is generated by the overlap of two hybrid orbitals, while the weaker π bond is formed by overlap of two p bonds.
In chemical graphics, two parallel lines between the bonding atoms represent a double bond.
Polar double bonds are generated if the bonding atoms show different electronegativities.
Double bonds joining at least three continuous carbon atoms are called cumulative double bonds .
Double bonds alternating with single bonds in molecules are named conjugated double bonds.
Recommended Learning Units
Introduction to Alkenes30 min.
This learning unit is the first short introduction to the family of alkenes.
Alkenes: Introduction15 min.
This learning unit gives an overview over alkenes, their occurence, importance and nomenclature.
Hydrogenation with Diimide20 min.
ChemistryOrganic ChemistryReduction Reactions
This learning unit describes the hydrogenation using the hydrogen donor diimide. The mechanism and practical setup of this reduction are explained.