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CBSE Class 10 Answered

why does unsaturated hydrocarbon shows addition reaction and saturated hydrocarbon shows substitution reaction?
Asked by | 12 Mar, 2012, 11:35: AM
answered-by-expert Expert Answer
In unsaturated hydrocarbons valency of carbon is fulfilled by double or triple bond there is space to add another substituent in place of multiple bonds between one carbon and other carbon of the same compound
In saturated compounds all carbons are attached through 4 single bonds, which means there is no space to add another substituent , if they undergo addition that would mean a particular carbon will be having 5 single bonds which is not desirable. They can only replace one of their groups with a new one.  thats why they always undergo substitution.
Answered by | 12 Mar, 2012, 11:45: AM
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