BSc Chemistry SEM IV 2018 19 Apr 2018-19 CHEMISTRY PAPER 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. (any twelve) 12 marks
   • (i) There are crystal system and Bravais lattices
   • (ii) The total number of effective atoms in body centered cubic
   • (iii) A accelerates a reaction by decreasing the energy of activation of the reaction
   • (iv) The enzyme which can catalyse the conversion of into glucose
   • (v) The equation for diffraction of X-rays is nA=
   • (vi) The total number of effective atoms in system is 2
   • (vii) pKarange for strongly acidic cation is in between
   • (a) 1 to 6 (b) 6 to 11.5 (c) -4 to
   • (viii) cation is strongly acidic if z?/r is in between
   • (a) 0.1 to 0.16 (b) 0.01 to 0.04 (c) 0.04 to 0.1
   • (ix) Pure phosphoric acid is crystalline solid
   • (x) acid is responsible for acid rain
   • (xi) pKa values are greater than 14 for cation
   • (xii) is called king of chemicals
   • (a) HNO3 (b) (c) H3PO4 Two moles of diketone are required in Hantzsch synthesis of
   • (xiv) Electrophilic substitution reaction in furan takes place at position
   • (a) (b) 3 and 5 (c) 3
   • (xv) — of furan can be carried out by actionof
   • (a) H2SO4 (b) SO3 and pyridine (c) oleum
   • (xvi) | Benzene diazonium chloride when reduced with NaHSO3 gives
   • (xvii) Nitration of aniline mainly gives as major products
   • (a) o- and p-nitroaniline m- and — (c) p- and m (xviii) Reaction of aniline with bromine water at room temperature
   • (B) State whether the following statements are true or false. (any three) 3
   • (i) As temperature increases the rate of reaction decreases and the energy of Sodium chloride crystallises in the face centred cubic lattice form
   • (iii) Hydrolysis of hydrated cation renders the solution basic
   • (iv) Phosphoric acid is a mineral acid
   • (v) Friedel - Crafts reaction of the furan can be carried out by using
   • (vi) Pyrrolidine is a stronger base than pyrrole
   • (C) Match the column. (any five) 5
   • (i) Inhibitor (a) Zn
   • (ii) Promoter (b)
   • (iv) Moderately acidic cation (d) Increases activity of catalyst
   • (v) Dimethyl amine (e)
   • (i) Retards rate of reaction
4. Q2 Attempt any four of the following. 20 marks
   • (A) What are (100), (110) and (111) planes for the body-centred cube?
   • (B) How are X-rays used to determine the interplanar distances in cubic crystals?
   • (C) Derive Michalis-Menten equation for enzyme catalysis Explain characteristic features of a catalysis
   • (E) An inorganic salt of molecular weight 74.36 and density 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 molecules
   • (F) Explain the kinetics of acid-base catalysis
5. Q3 Attempt any four of the following. 20 marks
   • (A) Explain the process of hydration of cation with suitable diagram. How can cation render acidity to the solution?
   • (B) the relationship between pKa, acidity and ratio of monoatomic cations by means of graphical presentation
   • (C) With the help of predominance diagrams explain non acidic cations and feebly acidic cations with suitable examples
   • (D) Write Latimer equation to calculate hydration energy of anion and explain the terms involved in it. Using this equation, calculate for F ion. (Given radius of F ion is 119pm.)
   • (E) Write physical properties of sulphuric acid
   • (F) Write a note on uses of phosphoric acid
6. Q4 Attempt any four of the following
   • (A) (i) Give the preparation of a) 2-chlorothiophene, b) 2-nitrothiophene and 3
   • c) thiophene-2-sulphonic acid from thiophene
   • (ii) Discuss aromaticity of furan. 2
   • (B) Explain Chichibabin reaction of pyridine. 3
   • (ii) Give the carbylamine reaction of primary amines. 2
   • (C) (i) ‘Pyridine gives nucleophilic substitution at 2,4 and 6 positions’. Explain. 3
   • (11) How is primary amine obtained by reductive amination of aldehyde and 2
   • (D) (i) Write a note on Hofmann exhaustive methylation (HEM). 3
   • (11) Give Paal-Knorr synthesis for the preparation of pyrrole. 2
   • (E) (i) How will you distinguish between ethyl amine, diethyl amine and triethyl amine 3
   • (ii) Explain Vilsmeier-Haack reaction of pyrrole. 2
   • (F) (i) Give azo-coupling reaction of benzene diazonium chloride with a) Phenol and 3
   • b) aniline
   • (11) How is hydrazobenzene prepared from nitrobenzene? 2
7. Q5 Attempt any four of the following
   • (A) Sodium chloride has a face centred cubic lattice and the length of the cube edgeis 5 6.56 Calculate diio and
   • (B) note on activity of nanoparticles as a catalyst. 5
   • (C) With the help of suitable predominance diagram, explain the behaviour of F and 5 S* in aqueous solution
   • (D) Write a note on acid rain. 5 () Describe Hofmannn degradation of amides. 3 How is chlorobenzene obtained by Sandmeyer reaction? 2
   • (F) G) Explain Diel’s-Alder reaction of furan. 3
   • (ii) Why is pyridine more basic than pyrrole? 2

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