JNTU
JNTU B.Pharmacy I Year PHARMACEUTICAL ORGANIC CHEMISTRY - I Previous Question Paper (November/December-2020 - R17)
Answer any five questions. All questions carry equal marks.
Main
Give the common and IUPAC system of nomenclature for first five carboxylic acids
Answer
| Number of Carbons | Common Name | IUPAC Name |
|---|---|---|
| 1 | Formic acid | Methanoic acid |
| 2 | Acetic acid | Ethanoic acid |
| 3 | Propionic acid | Propanoic acid |
| 4 | Butyric acid | Butanoic acid |
| 5 | Valeric acid | Pentanoic acid |
Explain chain isomerism with suitable examples.
Answer
Chain isomerism is a form of structural isomerism where compounds with the same molecular formula possess different arrangements of the carbon skeleton. This occurs because the carbon atoms can be linked in either a straight chain or a branched chain.
For example, consider the molecular formula C4H10 (Butane):
- n-Butane: CH3-CH2-CH2-CH3 (a continuous straight chain).
- Isobutane (2-methylpropane): CH3-CH(CH3)-CH3 (a branched chain).
Both isomers have the same molecular formula but differ in the connectivity of the carbon backbone, resulting in different physical properties such as boiling points.
What is isomerism? Write the various types of isomerism with an example. Write a brief note on structural isomerism.
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Write the kinetic of SN2 reaction.
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Explain the order of reactivity and rearrangement of carbocations.
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Explain the free radical addition reactions of conjugated dienes.
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Explain Markownikoff’s orientation with suitable examples.
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Discuss the SN1 versus SN2 reactions.
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Explain the factors affecting SN1 and SN2 reactions.
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Give the structure and uses of chloroform and dichloromethane.
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Write the qualitative tests, structure and uses of chlorobutanol and glycerol.
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Explain nucleophilic addition reactions of carbonyl compounds with an example.
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Give the structure and uses of Benzaldehyde and paraldehyde.
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What is basicity constant? Explain.
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Give the structure and uses of ethanolamine.
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