BSc Biochemistry Sem IV ATKT CHEMISTRY II Question Paper - Mumbai University | munotes

Questions asked in this paper

• Please check whether you have got the right question paper
• 2. Figures to the right indicate full marks

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) A substance that enhances the activity of a catalyst is called
   • (a) an auto catalyst (b) a promoter (c) an inhibitor
   • (ii) A NaCl crystal consists of NaCl per unit cell (iit) The Weiss indices of (110) plane are
   • (iv) Acid catalysed hydrolysis of methyl acetate is an example of ------ catalysis
   • (v) Cat? ion in water
   • (vi) Hydration of monoatomic cation is directly proportional to
   • (a) charge of cation (b) size of cation (c) square of charge of cation
   • (vii) smog is caused by high concentration of oxides of
   • (viii) is used in some soft drinks
   • (ix) Nitration of aniline gives mainly _ nitroaniline
   • (a) p- and m- (b) p- and o- (c) o- and m Ethyl amine when heated with acetic anhydride in presence of pyridine gives
   • (xi) Two moles of diketone are required in Hantzsch synthesis of pyridine Furan on treatment with DMF and POCIs gives
   • Q. P. Code: 51552
   • (B) State whether the following statements are true or false. 3 becomes more effective by catalytic poison Positively charged ions can furnish hydrated H* ion from water molecule
   • (ii) Halogenation of thiophene can be easily carried directly with halogens
   • (C) Match the column. 5
   • (iii) Gold supported on metal oxide feebly basic anion
   • (f) Simple cube
   • (g) Nano catalyst
4. Q2 (A) What do you understand by simple, face-centred and body-centred cubic lattice? Explain with the help of neat diagrams 5 marks
   • (ii) the Miller indices of the following crystal planes whose intercepts 3 on the X, Y and Z axes are as follows: (a) la: 2b: 3c (b) la: cob: Ic
   • (A) Derive the Bragg’s equation, nA = 2d sin 5
   • (ii). ‘KCl and NaCl are isomorphs. But KCI exhibits a simple cubic lattice whereas 3 NaCl shows FCC lattice’. Comment on this statement Explain the characteristic features of a catalytic reaction. 5
   • (ii) the help of examples explain what is meant by nano catalysis. 3
   • Q. P. Code: 51552
   • (B) (i) Define the term catalyst. What are the different types of catalysts? 5 Explain with suitable examples
   • (ii) How does a catalyst accelerate the rate of a reaction? 3
   • (C) The first order reflection from (100), (111) planes of a cubic system occurs at and Which type of cubic system the crystal belongs to?
   • (C) Discuss the kinetics of Acid-base catalysis. 4
5. Q3 (A) () How does water molecule attack the cation in aqueous medium? Explain whether the consequences of attack are same for all ions 4 marks
   • (ii) With the example of Cr*? ion, explain predominance of various species of 4 chromium in aqueous medium
   • (A) () On the basis of values, give classification of anions. 4
   • (ii) Discuss environmental aspects of phosphoric acid. 4
   • (B) (i) Write Latimer equation for calculation of hydration of monoatomic cation. 4 Explain role of charge and size of cation towards hydration
   • (ii) the basis of pKa values, classify the monoatomic cations. Provide one 4 example to each category () With suitable predominance diagram, explain the following anions: 4
   • (ii) Write uses of sulphuric acid. 4
   • (C) Calculate ratio for (r = 74pm). What will be its acid strength in aqueous + medium ? Does exist in aqueous medium ? Why ?
   • (C) Discuss physical properties of concentrated phosphoric acid. 4
6. Q4 (A) you obtain an aromatic amine by reduction of nitro compounds 3 marks
   • b) Explain the reaction of aliphatic and aromatic secondary amines with nitrous 2
   • (ii) Write a note on Sandmeyer reaction. 3
   • (A) (i) a) How will you obtain an aromatic amine using reductive amination? 3
   • b) Describe N-alkylation of aryl amines. 2
   • (ii) Write a note on Gomberg reaction. 3
   • (B) Explain:
   • a) in furan, the electrophilic substitution takes place at 2 or 5 position. 3
   • b) Paal-Knorr Synthesis for the preparation of pyrrole
   • (ii) Write a note on Chichibabin reaction of pyridine. 3
   • (B) Explain why?
   • a) in pyridine, the electrophilic substitution takes place at 3 or 5 position. 3
   • b) thiophene is aromatic in nature
   • (ii) Discuss Vilsmeier-Haack reaction of thiophene. 3
   • (C) @ azocoupling reaction of benzene diazonium chloride with phenol. 2 Discuss Friedel-Crafts reaction of pyrrole
   • (C) Explain azocoupling reaction of benzene diazonium chloride with 2
   • (ii) Discuss sulphonation of pyrrole. 2
7. Q5 Attempt any four of the following
   • (A) Derive Michaelis- Menten equation for enzyme catalysis. 5
   • (B) The first order reflection maxima from (100) plane of NaCl occurred at using 5 X- rays of wavelength 58.0 pm. If the density of NaCl is g nr? and gram molecular weight 58.5 calculate the Avogadro number
   • (C) Represent graphically pKa values of monoatomic cations as a function of charge, 5 size and electronegativity. Categorise the cations on the basis of ratios
   • (D) What do you mean by acid rain ? How does it occur? What are its consequences? 5
   • (E) i) Explain the effect of substituents on the basicity of aromatic amines. 3
   • ii) How will you replace diazonium group by —H ?
   • (F) Explain the following :
8. Q1 Diels-Alder reaction of furan li) pyridine is a weaker base compared to piperidine. 2

Read from the scan above, so a character or two may differ. The scan is the original.