Answer the following problems.
problem 1) Describe Huckel’s rule and its limitations. describe the modern concept of aromaticity with appropriate exs.
problem 2) prepare a detail note on the following:
(i) Alternant and non-alternant hydrocarbons,
(ii) Aromatic character of azulenes.
problem 3) describe optical activity of allenes.
problem 4) Describe the terms stereo specific and stereo selective synthesis with appropriate exs.
problem 5) What is asymmetric synthesis? describe the asymmetric synthesis using a chiral catalyst.
problem 6) Describe why trans –1, 3-di-t-butyl cyclohexane prefers a boat conformation.
problem 7) prepare a short explanatory notes on the following:
(i) Kinetically and thermodynamically controlled products,
(ii) Isotopic Labelling.
problem 8) describe the formation and reactions of carbenes.
problem 9) Describe neighbouring group participation with appropriate exs.
problem 10) Describe different factors that influence the nucleophilic substitution reaction to proceed by either SN1 mechanism or SN2 mechanism.