WHY ALKANES ARE LESS REACTIVE ?
Reasons of highly unreactiveness/Inertness of Alkane :
Non polar C-C bond and C-H bond:
The electronegativity of carbon (2.5) & hydrogen(2.1) do not differ appreciably.Therefore the bonding electrons
between C-H & C-C are equally shared and bonds become non-polar.Therefore, ionic reagents find no place in the alkane molecule for reaction.
Inertness of sigma bond:
In a sigma bond , the electrons are tightly held between the nuclei.Therefore, a lot of energy is required to break it.
The electrons in a sigma bond can neither attack on any electrophile nor a nucleophile can attack on them.Hence Alkanes are less reactive.
Why alkanes are called Paraffins?
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