JNTU
JNTU B.Pharmacy II PHARMACEUTICAL ORGANIC CHEMISTRY –II Previous Question Paper (April - 2023 - R17)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
What is Huckel’s rule? Explain with an example.
Answer
Huckel's rule states that a planar, cyclic, fully conjugated system is aromatic if it contains (4n + 2) π electrons, where n is an integer (0, 1, 2, ...). For example, benzene has 6 π electrons (n=1), satisfying the rule and exhibiting aromatic stability.
What type of reactions does benzene undergo? Explain.
Answer
Benzene primarily undergoes Electrophilic Aromatic Substitution (EAS) reactions. Because the π-electron cloud is stable and delocalized, benzene resists addition reactions that would destroy its aromaticity. Instead, electrophiles attack the ring to replace a hydrogen atom, maintaining the stable aromatic system.
Write any two qualitative tests for Phenols.
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Write the uses of Phenol and Naphthols.
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Define fats and oils. Give two examples for each.
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Explain Saponification value.
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What are polynuclear hydrocarbons? Write example and structures of them.
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Write the medicinal uses of Anthracene and Naphthalene with examples.
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What are cyclo alkanes? Which form of cyclobutane is stable?
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Write any two reactions of Cyclopropane.
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Part B
Give the synthesis and analytical evidence in the derivation of structure of benzene.
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Write the various Electrophilic substitution reactions of benzene.
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Explain the Acidity of Phenols and write the effect of substituents on acidity.
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Write the synthetic uses of aryl diazonium salts.
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Write the various reactions of fatty acids with an example.
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Define the following terms along with their significance and with the principle.
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Write the synthesis, reactions and medicinal uses of Phenanthrene.
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Write the synthesis, reactions and medicinal uses of Diphenyl methane.
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Explain Baeyers strain theory along with its limitations.
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Explain Sachse Mohr’s theory.
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