Rajiv Gandhi University of Health Sciences, Karnataka
I Year B. Pharm Degree Examination - 23-Mar-2021
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Time: Three Hours Max. Marks: 70 Marks
PHARMACEUTICAL ORGANIC CHEMISTRY - I (RS4)
Q.P. CODE: 2628
Your answers should be specific to the questions asked.
Draw neat, labeled diagrams wherever necessary.
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LONG ESSAYS (Answer any Two) 2 x 10 = 20 Marks
- What are elimination reactions? Discuss the kinetics, mechanism, orientation and reactivity of E1 reaction.
- a) Explain the mechanism of Friedel-craft alkylation with their limitations.
b) Discuss the orientation effect of i) Hydroxyl group in benzene ii) Nitro group in Benzene. - a) Define and classify carbocation. Add a note on stability of carbocation.
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b) Discuss the mechanism and stereochemistry of SN1 reaction.
SHORT ESSAYS (Answer any Six) 6 x 5 = 30 Marks
- Write the difference between SN1 And SN2 reactions.
- Write any three methods of preparation of cycloalkanes.
- Explain the mechanism of 1,2- and 1,4-additions in conjugated dienes.
- Discuss the mechanism involved in Benzoin condensation.
- Explain esterification reaction with mechanism.
- Discuss the mechanism for addition of hydrogen bromide to propene in presence of peroxides.
- Explain Cannizzaro condensation with mechanism.
- Write the Howarth synthesis of naphthalene.
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SHORT ANSWERS 10 x 2 = 20 Marks
- Define and classify Carbenes with examples.
- What is homolytic fission? Give example.
- What is keto-enol tautomerism? Give example.
- Write the halogenation of methane.
- Write the structure and IUPAC name of: a) tert-Butyl chloride b) Formamide.
- State the Saytzeff’s rule.
- Define diazotization reaction with an example
- What happens when Grignard reagent reacts with ketone?
- Write the structures of: a) Methyl salicylate b) m-Dinitrobenzene
- What is Williamson’s synthesis? Write an example.
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