BSc Chemistry SEM III ATKT 2017-18 ATKT Chemistry Paper II Question Paper - Mumbai University | munotes

Questions asked in this paper

1. Q2 Answers to the same questions must be written together
2. Q3 Figures to the right indicate full marks
3. Q4 Use of non-programmable calculator /logarithm table is permitted
4. Q1 (A) Select the correct option and complete the following sentences. 12 marks
   • (i) Nitration of phenol is an example of reaction
   • (ii) The reaction between H2+ 2HBr is involving as chain
   • (a) HBr molecules and (c) H2 and
   • (ii) is the mixture of an ideal solution
   • (iv) The mixture of two or more components is termed solution
   • (v) oxide of nitrogen is an odd electron molecule
   • (vi) In SiO2, central atom silicon undergoes hybridisation
   • (vii) Except _, elements of group 15 form trihalides
   • (a) nitrogen (c) arsenic
   • (viii) the oxide of nitrogen does not act as a reducing agent
   • (a) no atom (b) one alpha H-atom
   • (x) Dimethyl malonate is
   • (xi) Enols of 8 —diketones are stabilised by
   • (xii) Hybridization of Carbon in Carbonyl group is
   • (B) State whether the following statements are true or false. 3
   • (i) Phenol-Water system is an example of lower critical solution temperature
   • (ii) Ammonia is an electron deficient compound
   • (iii) Aldehydes are usually more reactive towards nucleophilic reagents than ketone
   • Q.P.Code: 30175
   • (C) Match the column. 5
   • (i) Unit of activation energy (a) CHa
   • (iv) ‘C’ in >C=O is (d)
   • (v) Banana bond = x2
5. Q2 (A) (i) Explain with suitable examples what is meant by consecutive reactions and parallel 5 marks
   • (ii) What are the merits of the collision theory of reaction rates? 3
   • (A) (i) Give an expression for the rate constant of a bimolecular reaction in terms of the 5
   • (ii) Explain the important steps in a chain reaction. 3
   • (B) (i) What are partially miscible liquids? Explain the term.“ Lower critical solution 5
   • (ii) Draw the vapour pressure-composition diagrams for the positive deviations from 3
   • (B) (i) State the Nernst distribution law. State the conditions under which the law is strictly 5
   • (ii) Discuss the variation of mutual solubility with temperature for the phenol-water 3
   • (C) If the rate of a reaction doubles from to Calculate the energy of activation of 4
   • (C) 30 g of liquid ‘A’ and 60g of liquid ‘B’ are mixed together to form an ideal solution. 4 Calculate the total vapour. pressure of an ideal solution. (Ma Ms = 90,
6. Q3 (A) (i) What is meant by electron deficient compound? Rationalise the Lewis acidity of BFsand 4 marks
   • (ii) Explain the structure and bonding in diborane. 4
   • (A) (i) Write a note on synthesis of borax. 4
   • (ii) What is tetraborane? How is it prepared? Find the number of 3c-2e bonds in 4
   • (B) (i) Name the hydrides of nitrogen family. Compare their stabilities with reasoning. 4
   • (ii) Nitrogen and bismuth do not form pentafluorides. Why ? 4
   • (B) (i) Name.correctly: and N20. Draw their structures. 4
   • (ii) Write a note on the preparations of NO and 4
   • (C) germanium occur in nature? How is it extracted? 4
   • (C) With the help of a suitable diagram explain the refining of silicon by Czochralski pulling 4
   • Q.P.Code: 30175
7. Q4 (A) (i) (a) Explain the mechanism of Claisen-Schmidt reaction with a suitable example. 3 marks
   • (b) How will you obtain Benzaldehyde using Friedel Craft acylation. 2
   • (ii) Write note on Rosenmund reduction. 3
   • (A) (i) Write Knoevenagel reaction and explain its mechanism with suitable an example. 5
   • (ii) Give preparation of 2-butanone from acetyl acetone. 3
   • (B) (i) a) Discuss the preparation of aldehydes and ketones by oxidation of alcohols by 3
   • b) Discuss the reduction of crotonaldehyde by. using LiAIHa. 2
   • (ii) Write a note on Gattermann Coach formylation. 3
   • (B) (i) How will you convert Ethyl aceto acetate into the following compounds? 5
   • (ii) Discuss the reduction of p- Nitro benzaldehyde by NaBHa. 3
   • (C) What are imines and enamines? How are aldehyde? 4
   • (C) Explain the reaction of Benzaldehyde with : 4
8. Q5 Attempt any four
   • (A) State the Lever rule. Explain the fractional distillation. 5
   • (B) The energy of activation for the dissociation of HI is 184.2 kJ The number of 5 molecules colloiding per cubic centimetre per second is 6 X at 556K. Calculate the specific reaction rate at 556K
   • (C) on synthesis of ammonia. 5
   • (D) What.are the applications of BH3 and BF3. 5
   • (E) (i) Discuss the mechanism of Base catalysed enolisation. 3
   • (ii) Explain the general mechanism of Acid catalysed nucleophilic addition reaction. 2
   • (F) Write the IUPAC name of CH3CHO. Give its preparation from suitable Grignard reagent. 5 How will 2-butanol from CH3CHO using suitable Grignard reagent?

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