*PG732*

PG – 732

IV Semester M.Sc. Examination, July 2013 (RS) (2006-2007 Onwards) CHEMISTRY C–403 – PC : Kinetics and Reaction Mechanisms Time : 3 Hours

Max. Marks : 80

Instructions : Answer question no.1 and any five of the remaining.

1. Answer any ten of the following:

(10×2=20)

a) What is cage effect ? Explain. b) Explain the inductive effect on rates chemical reaction with suitable example. c) What is meant by microscopic reversibility ? d) Write the reaction scheme for dehydrogenation of ethane. e) What are branched chain reactions ? f) Write the reaction scheme for cationic polymerization. g) Distinguish between catalyst inhibitor and catalyst poison. h) What is isokinetic temperature ? Give its significance. i) Explain drug-dissolution rate. j) What are N-haloamines ? k) Explain mean Tree path. l) What are oscillatory chemical reactions ? Give an example 2. a) Explain the effect of dielectric constant on the rates of chemical reaction. b) Explain Winstein-Grunwald relationship. c) Explain Hammett equation to understand the reaction mechanism.

(4+4+4=12) P.T.O.

*PG732*

PG – 732 3. a) What is volume of activation ? Give its significance. b) Discuss the kinetics and mechanism of pyrolysis of butane. c) Explain the effect of nucleophilic substitution on rates of reaction.

(4+4+4=12)

4. a) Discuss the kinetics and condensation polymerisation with a suitable example. b) Explain lower and upper explosion limits for H2 and O2 reaction. c) Explain an experimental procedure for production and identification of free radicals. (4+4+4=12) 5. a) Explain Ru (III) chloride catalysed oxidation reactions of an alcohol by chloramine-T in acidc medium, by assuming the kinetic data. b) Explain the intermediate compound formation theory for heterogenous catalysis. c) Explain Hammett-Zucker hypothesis for acidity function.

(4+4+4=12)

6. a) Explain the kinetics of protein-drug binding. b) Describe plasma–time, profile and its significance. c) Discuss kinetics of one compartment open model, for a drug system. (4+4+4=12) 7. a) Explain the contraction of potential energy sufaces and its application. b) Explain quantum mechanical tunneling. c) For decomposition of acetone dicarboxylic acid rate constant is 2.46×10–5 sec–1 at 300°C and 1.61×10–3 sec –1 at 330°C. Calculate the energy of activation. (5+4+3=12)

____________

Kinetics and Reaction Mechanisms.pdf

k) Explain mean Tree path. l) What are oscillatory chemical reactions ? Give an example. 2. a) Explain the effect of dielectric constant on the rates of chemical ...

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