Benzene nucleus present
in all the aromatic hydrocarbons is very stable; it gives a number of
substitution reactions but resists addition reactions. Benzene also fails to
give tests for unsaturation i.e. it does not decolourise alkaline KMnO4 and
bromine water.
Benzene gives electrophilic substitution due to It is
due to the following reasons:
(2) Due to the presence
of π-electron cloud above and below the plane of carbon atoms of the benzene
ring.
(2) Benzene ring acts as
a source of electrons for electrophilic reagents.
(3) In electrophilic substitution
aromatic character of benzene ring is preserved due to resonance
stabilisation. The formation of formation of addition product
will destroyed the aromatic ring structure of benzene and therefore
addition takes place with very difficulty. On the above explanation we can say
that electrophilic substitution reactions are feature of benzene ring.
Good explanation.
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