Dr. A.P.J. Abdul Kalam University MSC III SEM (Chemistry) Photo Chemistry (MSC-302T) Dec 2020 Question Paper

Dr. A.P.J. Abdul Kalam University

Master of Science (Chemistry)

Third Semester Main Examination, Dec-2020

Photo Chemistry (MSC-302T)

Time: 3:00 Hrs Max Marks 85

Note: Attempt all questions. Each question has two parts. Part A is 10 marks and part B is

7 marks.

Q.1 (a) Explain fate of excited molecules by Jablonski diagram.

(b) Write short note on:-

(i) Quantum yield

(ii) Actinometry

OR

(a) Explain the following:

(i) Types of excitations

(ii) Photochemical reactions

(b) Explain transfer of excitation energy.

Q.2 (a) Describe different types of photochemical reactions with suitable examples.

(b) Explain the determination of reaction mechanism of photochemical reaction.

OR

Discuss the following:-

(a) Gas phase photolysis

(b) Determination of rate constant of reaction

Q.3 (a) Explain the rearrangement of 1,4 and 1,5 dienes.

(b) Define cyclisation reactions.

OR

(a) Describe cis-trans isomerisation of stilbene by the use of photosensitizer.

(b) Explain the photochemistry of alkene.

Q.4 (a) Explain the α-β unsaturated carbonyl compounds.

(b) Describe oxetane formation.

OR

(a) Describe the photochemistry of carbonyl compounds.

(b) Explain cyclohexadienones.

Q.5 Write short note any two of the following.

(a) Barton reaction

(b) Photochemical formation of smog

(c) Photodegration of polymers

(d) Photo-fries rearrangement

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