Chemistry of Oxygen-Containing Functional Groups and Their Applications to Biology — DU B.Sc (hons) Chemistry Previous Year Question Papers

5. 6. (b) What happens when benzamide is heated in aqueous NaOH? Give the reaction and mechanism. (c) Compound A,C3H8O on reaction with PCC gives compound B. B gives –ve iodoform test, and can be oxidized into a carboxylic acid C, which have the same number of carbon atoms. Compound D is the isomer of B, which gives +ve iodoform test, but can’t be oxidized in mild conditions. Identify the compounds A, B, C & D. Give the reactions involved. (5,5,5) Differentiate between the following : (with suitable examples) (any three) (b) Alcohols and phenols (c) primary, secondary and tertiary alcohols (d) Nucleophilic addition and nucleophilic addition-elimination reactions (5,5,5) Write Short Notes on the following (Give mechanism also): (any three) (b) Benzoin condensation (c) Cannizzaro reaction (d) Perkin reaction (5,5,5) Containing Functional Groups and their Applications to All questions cany equal marks i.e. 15 marks. 1. (a) Arrange the following in decreasing order of their nucleophilic acyl substitution & justify your answer : (b) What happens when benzoic acid is refluxed with ethyl alcohol in presence of catalytic amount of conc. H2SO4? Discuss it with the help of mechanism. (c) What is Iodoform test? Give the reaction and mechanism. (5,5,5) 2. Predict the products and give the name of the reaction involved : (15) 3. 4. (a) How will you convert: (No mechanism) (i) Benzyl alcohol to Benzaldehyde (ii) Ethyl acetate to Ethyl acetoacetate (iii) Acetone to Isopropyl alcohol (b) What is Aldol condensation? Give its mechanism and biological applications. (c) How will you obtain : (i) Benzoic acid from Benzamide (ii) Salicylaldehyde from Phenol (iii) p-Bromophenol from Phenol (5,5,5) (a) Match the following : A (Reaction) B (Reactants) i) Reimer-Tiemann reaction (a) Esters ii) Wittig reaction (b) Aldehydes iii) Claisen condensation reaction (c) Amides iv) Lucas test (d) Phenols v) Cannizzaro reaction (e) Ketones