1.

Write a short note on aromaticity.

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 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 π 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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