Distinguish between Homolysis and heterolysis.
|No.||Homolysis (Homolytic fission)||Heterolysis (Heterolytic fission)|
|1.||The symmetrical breaking of a covalent bond in which each departing atom takes one electron from the bonding pair is called as homolytic fission.||The unsymmetrical breaking of a covalent bond in which one of the departing atoms retains the bonding pair is called heterolytic fission.|
|2.||In this type of fission, the formation of free radicals (uncharged species) bearing unpaired electrons takes place.||In this type of fission, the formation of charged species called ions, like carbocation or carbonium ion takes place.|
The covalent bond between two atoms of the same element or two atoms having nearly the same electronegativity breaks in this manner.
The covalent bond between two atoms of the different elements or two atoms having different electronegativity values breaks in this manner.
|4.||This takes place favourably in a nonpolar solvent.||This takes place favourably in a polar solvent.|
|5.||Generally, reaction takes place at high temperature or in presence of UV light or peroxides.||Heterolysis takes place in solutions (polar condition).|
Concept: Theoretical Basis of Organic Reactions
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