Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Pharmacy II PHARMACEUTICAL ORGANIC CHEMISTRY-III Previous Question Paper (March - 2024 - 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 are enantiomers? Give examples?
Answer
Enantiomers are stereoisomers that are non-superimposable mirror images of each other. They possess identical physical and chemical properties in an achiral environment, but differ in their ability to rotate plane-polarized light in opposite directions.
Examples include D-glucose and L-glucose, or (+) lactic acid and (-) lactic acid.
Define diastereomerism?
Answer
Diastereomerism is a type of stereoisomerism where molecules have the same molecular formula and sequence of bonded atoms (constitution) but are not mirror images of each other. Unlike enantiomers, which are non-superimposable mirror images, diastereomers possess different physical and chemical properties, such as different melting points, boiling points, and solubility. This phenomenon typically occurs in compounds containing two or more chiral centers, where the configuration at one or more, but not all, of the chiral centers differs between the isomers.
What is cis and trans isomerism? Give example.
Answer
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Write the structures of conformations of cyclohexane?
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Classify heterocyclic compounds?
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Write the properties of furan.
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What are the medicinal uses of purines?
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Write the synthesis of indole?
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Write the advantages of NaBH4 reagent in reduction?
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What is the reagents used in wolff kisher reduction?
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Part B
Write note on elements of symmetry.
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Write about racemic mixtures and resolution of racemic mixtures?
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Discuss conformational isomerism in n-butane.
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Write stereo specific reactions in biphenyl compounds.
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Write synthesis of furan.
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Write the reactions of thiophene.
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Write note on azepines and their derivatives.
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Write the synthesis of purines.
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Discuss the bechmann rearrangement.
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Discuss the claisen Schmidt condensation.
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