BSc Biochemistry Sem I ATKT 2017-18 ATKT FYBIO CHEM Chemistry II Question Paper - Mumbai University | munotes

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1. Q2 Answers to the same questions must be written together
2. Q3 Figures to the right indicate full marks
3. Q4 The use of log tables non — programmable calculator is allowed
4. Q1 A) Select the correct option and complete the following sentences 12 marks
5. Q1 If the rate of a reaction = K[A]* [C]’ then the order of a reaction is
   • ii) With increase in molecular mass of a liquid, the viscosity
   • (a) Increases
   • (b) Decreases
   • (c) no effect
   • iii) The rate of a chemical reaction
   • (a) Increases as the reaction proceeds
   • (b) decreases as the reaction proceeds
   • (c) remains constant as the reaction proceeds Iv) Insect can walk on the surface of water due to
   • (a) Viscosity
   • (b) Surface tension
   • (c) Refractivity
   • v) The element with maximum metallic character in Group 15 is
   • (a) Nitrogen
   • (b) Arsenic
   • (c) Bismuth
6. Q0 Group 13 elements are block elements
   • Q.P. Code :19945 Vil) is a harmful product of photochemical smog
   • (a) Peroxyacyl nitrate
   • viii) The general electronic configuration of Group 17 elements is
   • ix) Among the following will exhibit optical isomerism
   • x) A plane polarized light is obtained by passing an ordinary light through
   • (a) Spectrophotometer
   • (b) Nicol’s Prism
   • (c) pH. meter
   • xi) The absolute configuration of L.- Glyceraldehyde is
   • xii) The spatial orientation of the atoms of is called
   • (a) Constitution
   • (b) Configuration
   • (c) Composition
   • B) State whether the following statements are true or false 03 1). Acid catalysed inversion of a cane sugar (sucrose) is the first order reaction
   • ii) The oxidation states exhibited by Group 15 elements are +1 and +2
   • iii) Fischer Projection formula represents molecule in staggered conformation
   • Q.P. Code :19945
   • C) Match the Following Columns iv) 5
   • v) ‘n’ number of asymmetric Carbon e) CaO
7. Q2 A i) A first order reaction is 70% complete in 180 sec. Calculate the time required for the completion of 95% reaction 5 marks
   • ii) Explain the graphical representation of a first order reaction. 03 A 1) Calculate the time required for the completion of 40% and 60% of a first order reaction, 05 whose rate constant K=2.18 x sec
   • ii) Explain Acid catalysed inversion of a cane sugar (sucrose). 03 B 1). In the determination of surface tension of a liquid by the drop number method, it gives 55 05 drops while water gave 25 drops for the same volume. The densities of the liquid and water are 0.996 and respectively. Find the surface tension of the liquid if that of water
   • i) Give the classification of liquid Crystals. 03 B 1) The refractive index at 295.9K of ethyl alcohol for D-line is 1.3611 and its density is 0.7885 05 Calculate the molar refraction of ethyl alcohol
   • ii) any three factors which affect the viscosity of a liquid. 03 C i) Define (a) Molecularity of a reaction (b) Half time of a reaction 02
   • ii) Define (a) Surface tension (b) Coefficient of viscosity 02
   • Q.P. Code :19945 C 1) Define (a) Order of a reaction (b) Rate of a reaction 02 li) Define (a) Relative viscosity (b) Liquid crystals 02 3A 1) Lithium behaves differently with respect to other elements of Group 1. Justify the 04 li) What are the similarities between beryllium and aluminium? 04 A 1) What is allotropy? Explain any two allotropic modifications of sulfur. 04 li) What are the oxidation states exhibited by group 14 elements? Elaborate with respect to 04 B 1) What are the different types of oxides formed by alkali metals? Explain the method of 04 formation of any two types of oxides li) Write the general formula of hydroxides formed by Group 2 elements. Describe the 04 variation in the basic character of the hydroxides of Group 2 elements B 1) What are nitrides? Give complete balanced equations for the following reactions. 04
   • (a) Hydrolysis of lithium nitride
   • (b) Hydrolysis of beryllium nitride
   • (c) Heating of magnesium nitride in current of hydrogen sulfide li) Give one method of preparation of alkali metal and alkaline earth metal carbides? Write 04 two. applications of the carbides C How is sodium bicarbonate prepared? Give one physical property and two applications of sodium 04 C Give one method of preparation, one chemical property and two applications of sodium hydroxide 04
   • Q.P. Code :19945
8. Q4 A 1) Convert following Newman projections into Fischer Projections and identify the meso li) In a molecule of 1-Bromo-1-chloroethane how many stereogenic centres are there? Draw 04 enantiomers of it. Will this molecule be optically active or inactive? A 1) Distinguish between Enantiomers and Diastereoisomers. 03 li) Using Newman Projection Formula draw different conformations of n-butane considering (C2 — C3) bond. Comment on their relative stabilities with energy profile diagram. 05 B 1) Explain geometric isomerism in olefins and cyclic compounds with suitable example 04 li) What is meant by the term Threo and Erythro ? Explain with suitable example. 04 B i) Label the following as diastereoisomers enantiomers meso isomers 04 4 marks
9. Q1 Me Me
10. Q2 CHO CHO
    • Q.P. Code :19945
    • ii) Draw Fischer Projection Formulae of any two isomers of 2,3 — dichlorobutane and convert them 04 into Sawhorse Projections C Assign R or S descriptors to the following molecules. Justify your answer. 04
11. Q1 H CHO C What is conformation? Draw the most stable and least stable conformation of ethane using Newman 04 Projection and Sawhorse Projection
12. Q5 Attempt any Four of the following
    • A. expression for the rate constant of a second order reaction with equal initial 05 concentrations of the two reactants
    • B. 1) Explain Ostwald’s isolation method of determination of a order of a reaction. 02
    • ii) Draw a neat, labelled diagram of Stalagamometer and give its use. 03
    • C. Describe any two sources of sulfur oxide emissions and the health hazards caused by these 05
    • D. What are the different types of oxides of nitrogen which act as air pollutants? 05 Describe two. control techniques of nitrogen oxide emissions
    • E. 1) Assign E/Z descriptors to the following geometrical isomers. Justify your answer 03
    • ii) What is racemic mixture? 02
    • Q.P. Code :19945
    • F. i) Which of the following compound have stereogenic centre? 03
    • ii) Assign D and L configuration to the following compounds 02
13. Q1 OOH CHO

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