BSc Biochemistry Sem IV ATKT 2018-19 ATKT SYBIO CHEM Chemistry II Question Paper - Mumbai University | munotes

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1. Q3 Use of log-table/nonprogrammable calculator is allowed
2. Q4 Answers for the same question as far as possible should be written together
3. Q1 Select the correct option and complete the following sentences. 12 marks
   • (i) There are crystal system and _ Bravais lattices The total number of effective atoms in a unit cell of body centered cubic (ili) A accelerates a reaction by decreasing the energy of activation of the reaction
   • (iv) The enzyme which can catalyse the conversion of __ into glucose is
   • (v) hydration of cation, pole of water approaches the cation cannot render _ to aqueous solution
   • (vii) is called as laughing gas
   • (a) (b) NO (c) (vili) Nitrous oxide is used as
   • (ix) diazonium salt on treatment with steam gives
   • (x) does not undergo acetylation reaction (xi)
   • Q. P. Code: 51550 of thiophene is carried out by con HNO; in presence of
   • (B) State whether the following statements are true or false. 3
   • (i) As temperature increases the rate of reaction increases
   • (ii) Water is amphoteric in nature of the furan can be carried out by the action of
   • (C) Match the column. 5
   • (a) decreases activity of catalyst Oxide ion (b) increases activity of catalyst
   • (v) Piperidine (e) retards rate of reaction
4. Q2 (A) State Bragg’s equation? Derive and explain n A= 5 marks
   • (i) What are (100) and (111) planes for the body-centered cube ? 3
   • (A) How are X-rays used to determine the interplanar distances in cubic crystals? >
   • (ii) Explain Weiss indices of a plane. 3
   • (B) What is heterogeneous catalysis? Explain with suitable examples. 5
   • (ii) Write a note of activity of nanoparticles as a catalyst. 3
   • (B) (i) Describe the characteristic features of catalysis. 5
   • (ii) What are the different types of catalysed reactions? 3
   • (C) An inorganic salt of gram molecular weight 74.56 and density 4 1.874 x crystallises in a form like NaCl. Calculate the length of the edge of the unit cell if Avogadro’s number is 6.023 x
   • (C) Discuss the kinetics of acid-base catalysis. 4
5. Q3 (A) diagram, explain, how do water molecules surround cation in aqueous medium? What is the name of this phenomenon ? Will this reaction be exothermic or endothermic ? 4 marks
   • (ii) Write and explain stepwise reactions for behaviour of ions in aqueous 4
   • (A) Discuss hydration of sulphide anion with suitable hydrolysis reactions. 4
   • (ii) Discuss sources of emission of nitrogen oxides. 4
   • (B) (i) is the effect of charge and size of cation in aqueous medium on its acidic 4
   • (ii) Calculate ratio for = 131 pm). Explain its acid strength in aqueous 4
   • (B) Draw a suitable predominance diagram and explain the following 4 Write uses of HNO3. 4
   • (C) With a suitable predominance diagram, explain non acidic cation. Mention the 4 reason for its non acidity
   • Q. P. Code: 51550
   • (C) Discuss physical properties of concentrated sulphuric acid. 4
6. Q4 (A) Explain the nitration and sulphonation reactions on furan and pyrrole. 5 marks
   • (ii) Discuss reduction of pyridine under different conditions. 3
   • (A) (i) Explain why?
   • a) in thiophene, the electrophilic substitution takes place at 2 or 5 position. 3
   • b) Explain aromatic character of pyrrole. 2
   • (ii) Write a note on Friedel Crafts alkylation of furan. 3
   • (B) a) Write anote on Sandmeyer reaction. 3
   • b) What are azo compounds? Explain the preparation of azo compounds. 2
   • (ii) Write a note on Gomberg reaction. 3
   • (B) Explain the action of nitrous acid on primary amine, secondary amine and 5
   • (ii) Whatis the reaction of Benzene diazonium chloride with Phenol and Tertiary 3
   • (C) Explain ‘Pyridine undergoes nucleophilic substitution at 2,4 and 6 positions. 4
   • (C) 1) How will you convert aniline to diphenyl amine ? 4 ti) Write a note on carbylamines reaction
   • Q. P. Code: 51550
7. Q5 Attempt any four of the following
   • (A) Sodium chloride has a face-centered cubic lattice and the length of the cube Calculate dioo and
   • (B) Derive Michalis-Menten equation for enzyme catalysis. 5
   • (C) Explain pKa value range and acidity of monoatomic cations in aqueous medium. 5
   • (D) Write a note on photochemical smog. 5
   • (E) Explain the following reactions of amines
8. Q1 reductive amination
   • (F) i) Discuss Vilsmeier Haack reaction of thiophene 3 il) Write resonance structures of furan 2

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