Maharashtra BoardEnglish MediumSTD 11 ScienceChemistryHydrocarbons4 Marks
Question
Write a short note on aromaticity.
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Answer
$i.$ All aromatic compounds undergoes substitution reactions rather than addition reactions and this property is referred to as aromaticity or aromatic character.
$ii.$ The aromatic character of benzene is correlated to its structure.
$iii.$ Aromaticity is due to extensive cyclic delocalization of $p$ electrons in the planar ring structure.
$iv.$ Three rules of aromaticity that is used for predicting whether a particular compound is aromatic or non$-$aromatic are as follows:
Aromatic compounds are cyclic and planar $($all atoms in ring are $sp^2$ hybridized$).$
Each atom in aromatic ring has a $p$ orbital. The $p$ orbitals must be parallel so that continuous overlap is possible around the ring.
Huckel rule: The cyclic $\pi$ molecular orbital formed by overlap of $p$ orbitals must contain $(4n + 2) p$ electrons, where $n =$ integer $0, 1, 2, 3, …$ etc.
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