BSc Chemistry SEM III 2018 2019 2019 Chemistry I Question Paper - Mumbai University | munotes

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1. Q1 All Questions are compulsory
2. Q2 Figures to the right indicate full marks
3. Q3 The use of log-table/nonprogrammable calculator is allowed
4. Q4 Answers for the same question as far as possible should be written together
   • (A) Select the correct option and complete the following sentences 12
   • (i) The change of free energy with pressure at constant temperature is
   • (iii) When reaction out from aqueous solution Keg is
   • (iv) On passing electrical current through an electrolyte solution both the ions moves towards cathode
   • (v) The sum of the transport number of cations and anions of an
   • (vi) The equivalent conductance of a solution of an electrolyte
   • (a)Decreases with dilution, with dilution,
   • (c) Does not vary with dilution (vil) In NaCl ionic crystal, the co-ordination number of positive ion is that of negative ion
   • (a) Greater than (b).Less than (c) Same as (Vili) Born- Lande equation is used to calculate
   • (ix) Bond order in C2 molecule
   • (x) molecule has structure
   • (xi) is least stable among the following
   • (a)C2 (b) No (c) ion has antibonding electrons more than O2 molecule
   • (xiv) SN? Mechanism generally results in a product having
   • (a) Retention of configuration (b) Inversion of Configuration
   • (c)Racemic Mixture
   • (xv) Phenyl magnesium bromide reacts with Carbon dioxide to form an adduct which on subsequent acidic hydrolysis (Xvi) Alcohols react with acetyl chloride to form Butyl Lithium reacts with water to form The method of heating chlorobenzene with NaOH under pressure to form phenol is called
   • (B) State whether the following sentences are True or False(any three) 03
   • (i) For strong electrolytes degree of dissociation is nearly equal to one For pure substance, chemical potential is entropy per mole High electron affinity of non metal favours the formation of an ionic
   • (iv) BF3 molecule has tetrahedral geometry
   • (v) Para nitro phenol is less acidic than phenol
   • (C) Match the following(any five) 05
5. Q2 Attempt any four of the following
   • (A) Explain variation of chemical potential with pressure and temperature. 05
   • (B) The equilibrium constant for certain gaseous reaction is 1.21x 10* at 05 1200 K and 4.08 x 10% at 1400 K. Calculate heat of reaction
   • (C) Write note on : Partial molal properties 05
   • (D) Discuss the determination of ionic product of water by 05
   • (E) The conductivity of 0.01 N acetic acid solution when measured in a 05 conductivity cell of cell constant 1.05 found to be 4.32x 10* S, Calculate the degree of dissociation and dissociation constant of acetic acid at this concentration
   • (F) Differentiate between electronic conductors and electrolytic 05 Attempt any four of the following
   • (A) Define the term ‘Resonance’. Give the different conditions for 05
   • (B) State the different energies involved in stepwise determination of 05 lattice energy by Born-Haber cycle and explain any two of them
   • (C) Show that the presence of lone pair of electrons affects the regular 05 geometry of ammonia and water molecule
   • (D) On the basis of LCAO method, explain the formation of bonding 05
   • (E) Draw the structures of SiCl4 and XeF4 molecules. State the type of 05 hybridisation and geometries observed in them
   • (F) Define Radius ratio and limiting radius ratio.Calculate radius ratio 05 and predict coordination number of Zn** in ZnSe ionic crystal Radius of Radius of 1.98
6. Q4 Attempt any four of the following
   • (A) Give the synthesis of and Naphthols.Which isomer is more stable 05 a or B and why ? What will be the product formed when B Naphthol is treated with Dimethyl Sulphate in presence of NaOH ? Give the
   • (B) What is Cine Write a descriptive note on Cine 05 Substitution. What will be the products formed when are treated with in liquour NH3
   • (C) Complete the following reactions : 05
   • (i) Dry ether
   • (D) How is propyl lithium prepared? Give any one method of preparation What is the action of the following reagents on propyl lithium? explain giving reactions only :
   • (E) How will you synthesize the following, give reactions only 5
   • (a)Dibuty] ether from butanol
   • (b)Ethylene chlorohydrin from ethylene oxide
   • (c)2,4,6- tribromo phenol from phenol
   • (d)Propylene oxide from propene
   • (e)Methyl Acetate from methanol
   • (F) Give any one method of preparation of ethanol ? Why does ethanol 05 have a higher boiling point than diethyl ether , even though their molecular weights are the same? What is the reaction of the following reagents on ethanol :
7. Q5 Attempt any four of the following
   • (B) Describe. moving boundary method to determination of transport 05 number of ion
   • (C) Draw molecular orbital diagram of H2 and molecule. Calculate 05 their bond order and mention magnetic property of each
   • (D) Comment on shape of iodine pentafluoride molecule on the basis of 05 Explain the mechanism of alkaline hydrolysis of tertiary butyl 05 bromide giving the energy profile diagram and stereochemistry of the
   • (F) How will you convert the following, giving reactions only 5
   • (a)Ethylene oxide to ethanol amine
   • (b)Benzene sulphonic acid to phenol
   • (c)Methyl magnesium bromide to tertiary butanol
   • (d)2- propanol to propene lithium to ethane

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