State Huckel's rule.
Name three heterocyclic compounds which are aromatic in nature.
Will cyclo-octatetraene show aromatic character?
Cyclobutadiene is not aromatic. Explain.
what are annulenes? Give one example.
Which of the following exhibits aromaticity:(i) Cyclo - octatetraene (ii) Cyclopentadiene (iii) Tropylium cation?
Give two examples of ions which are non-aromatic. Why don't they exhibit aromaticity?
Is benzene same as 1, 3, 5-cyclohexatriene?
What is the role of catalyst in electrophilic substitution reactions?
Name the catalysts used in electrophilic aromatic substitution reactions.
It may be either Lewis acids (such as anhydrous AlCl3 or ferric chloride) or protonic acids (such as H2SO4).
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