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PMS 2023 Chemistry Paper 1
a) Explain the rules of resonance with examples. Discuss the contribution of different canonical forms.
a) Describe various types of electronic transition and types of absorption bands which arise as a result of electronic transition in compounds.
b) Explain the difference between:
(1) Red shift and blue shift
(2) Transmittance and absorbance
(3) Chromophore and auxochrome
(4) Allowed and forbidden transition
a) How will you synthesize ethyl phenyl ketone from each of the following compounds?
(1) Benzene
(2) Benzoyl chloride
(3) Benzoic acid
(4) Benzaldehyde
(5) Benzonitryl.
a) How will you prepare following compounds starting from benzene in two step mechanism?
(1) p-Chloro nitrobenzene
(2) m-Chloro nitro benzene
(3) Ethyl cyclohexane
(4) n-Propyl benzene
(5) m-Dinitro benzene
a) What are carbohydrates? Discuss metabolism of carbohydrates.
b) What are Lipids? How you can classify them. Discuss their importance.
a) What is TLC? Explain its mechanism. Discuss its applications.
b) Compare gas chromatography with liquid chromatography.
a) Discuss the application of Dyes.
b) What are pigments? How they can be manufactured? Give some examples.
a) Explain the conformational analysis. On what factors conformational energy depends?
b) Define optical activity. What are chiral compounds? How chirality is determined by using polarimeter?
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