Problem 1
What is Kekule structure of benzene? What are its limitations?
Problem 3
What is aromaticity? What are the various characteristics which differentiate aromatic compounds from aliphatic compounds?
Problem 5
What are annulenes?
Problem 6
Define aromatic, anti-aromatic, and non-aromatic compounds.
Problem 7
Giving suitable explanation, classify the following compounds as aromatic, non-aromatic, and anti-aromatic. (a) Cyclobutadiene (b) Cyclopentadienyl cation (c) Cyclopentadiene (d) Cyclopropenyl anion (e) Cycloheptatrienyl anion (f) Tropylium ion (g) Cyclooctatetraene (h) Naphthalene (i) Anthracene (j) Phenanthrene
Problem 8
How does Huckel's rule explain the aromatic character of heterocyclic compounds? Explain with examples.
Problem 11
Write down the reagents and products obtained in the following electrophilic substitution reactions of benzene. (a) Halogenation (b) Nitration (c) Friedel-Crafts alkylation (d) Friedel-Crafts acylation (e) Sulfonation
Problem 12
Describe the ozonolysis reaction of benzene.
Problem 13
Describe the addition reaction of benzene with hydrogen and chlorine.
Problem 15
. Compare the reaction of benzene and toluene with chlorine (a) In presence of catalyst \(\mathrm{FeCl}_{3}\) (b) In presence of light
