ASPIRANTSHUB.IN
Aromatic compound are a group of unsaturated closed chain compounds.The behaviour of aromatic compounds is different from that of the aliphatic compounds. Benzene is the simplest example of aromatic compound, having molecular formula, C6H6 . It is highly unsaturated. According to Kekule, bezene has a six membered carbon ring with three alternate double bonds, which can have two different arrangements
Benzene
exhibits a peculiar behavior. Benzene is highly
unsaturated but does not give addition
reactions with HCl,
HBr etc.
which are characteristic of unsaturated compounds
like
alkenes and alkynes. Benzene ring is very
stable and
resists oxidation . Instead
benzene
undergoes substitution reactions, which
are characteristic of
saturated
compounds, in which the
ring
is found to
remain intact.
Thus, they
show some saturated behaviour.
This type of behaviour shown by benzene and other compounds is called
aromatic character or
aromaticity.Aromaticity
is therefore defined as the ability
of.many
cyclic,
highly unsaturated compounds to undergo
substituitton reactions rather than the
expected
addition
reactions, to
resist
oxidation and to
exhibit
stability
of the ring .
characteristics of aromatic compounds
1)They are highly unsaturated.
2)They are cyclic
compounds,and the atoms of the ring lies in the same
plane
3)They give substitution reactions instead of the
addition reactions.
4)The double bonds and single bonds are arranged alternatively in the ring
5)The structure of the actual molecule is an intermediate between the resonance structures.
6)They have generally lower values of heats of hydrogenation and, combustion than actually expected.
7)Aromatic compounds are less reactive and more resistant to oxidation than corresponding unsaturated aliphatic compounds.r
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1)Theyare Cyclic
Compounds. 2)They contain less hydrogen atoms than carbon atoms
3)They are highly unsaturated. 4)They contain an alternate system of single and double bonds. 5)Aromatic compounds are less reactive and more resistant to oxidation
'6)Th burn with a sooty flame. |
1)They_are open chain compounds.
2)They
contain
morehydrogen
atomsthan carbon
atoms.
3)They ma be saturated or unsaturated
4)The
unsaturated compounds may or
may
not contain an alternate system of single and double
bonds.
5)Aliphatic unsaturated compounds are highly reactive and they are
highly reactive and
they are
easily
oxidized. 6)The burn with a non sooty flame
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>>Aromaticity
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>>Huckels Rule, Resonance Energy
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>>Benzenoid Hydrocarbons ----------------------
>>Non Benzenoid Hydrocarbons
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>>Anti-Aromaticity
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>>Anti-Aromatic compounds
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