Green Chemistry in Organic Synthesis — DU B.Sc (hons) Chemistry Previous Year Question Papers

N`ame of the Paper Durat'ion : 3 Hours` : DSE : Green Chemistry in Organic Synthesis : B.Sc. Qlons.) Chemistry MaximumL Marks. : 90 There are eight questions in all. (i) Fill in the blanks with appropriate terns : (a) Designi.ng synthetic methods to maximize the incorporation of all materials used in the process into the final product is known as..............................'........ (c) 'The number of moles. of product produced per mole of catalyst per second is known as ....................................... (cZ) Photoreduction of C02 to C`H4 majorly deals with the ...................................... principle of green chemistry. (I.i) Explain `design for degradation' with fzuo` suitable examples in the context of green chemistry ? (a.I.i) Discuss the statement, Risk = f I(Hazard} x (Explore)I. Also, explain the terms involved. (£z;) Explain the Kyoto Protocol, an international treaty extending the 1992 United Nations Framework Convention on Climate Change (i) What is nanozyme and how does it help in green chemistry organic synthesis ? Explain with a suitable example. (jz) State any *faree of the twelve principles of green ch:mistry. GZZ) Define the following with example : (ci) Benign by product (a.) Turnover frequency (Z) What are the benefits of using mi;rowave irradiation in organic synthesis from a green che`mistry perspective ? Explai.n with an example. What is a supercritical fluid ? Give an example of its application as a green solvent or reaction medium. (a.ZZ) How healthier fats and oils can be synthesized. by interesterification method ? Discuss. 4. 5. (I.u) Classify organic solvents on the basis of their toxicity. Give examples of Green solvents. 4,4,4,3 (i) Explairi the synthesis of vitaminic. using Hoffroan La Roche method. (I.Z) Differentiate Homogeneous and Heterogeneous catalysts. (I.ZZ) What is *aste or pollution prevention hierarchy ? Explain with diagram.. (Zz;) What. are ionic liquids ? Why are they`. considered as .`designer solvents'? 4,4,4,3 G) What do you understand by the term "what you. don't have can't harm you" ? Explain with suitable .exa.mple. (I.I.i) What are auxi.Iiary substances? Discuss the problems associated with Volatile organic. solvents. (I.u) Give o7ze example of electrocatalysis. \ 4,4,4,3 (i) What do you understand by atom economy and percentage yield? Explain with example. (ii) What is protecting group in the organic synthesis? How protection and deprotection by protecting group help in the atom economy in the organic synthesis. (iii) Why green chemistry is also known as environmentally benign chemistry ? 5,5,5 (i) Explain how cradle to cradle recycling concept is applied to carpets? (ti) Green chemistry and sustainable development are inter-related. (iii) Discuss the advantages of combinatorial approach over conventional synthesis. 5,5,5, Write short notes on : (i) Environmental impact factor Biomimicry and green chemistry