BSc Biochemistry Sem III 2018 2019 Oct 2019 CHEMISTRY PAPER II Question Paper - Mumbai University | munotes

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• 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. (any twelve) 12 marks
   • (i) -------- is an example of parallel reaction
   • (a) Nitration of phenol (b) Oxidation of benzyl alcohol
   • (c) Reduction of benzaldehyde
   • (ii) The units of energy of activation are
   • (iii) A consecutive reaction is represented as
   • (iv) ------ extraction process is more efficient
   • (v) The completely miscible solution can be separated by (v1) -------- shows negative deviation from Raoult’s law
   • (a) and acetone (b) and CoHsOH = (c) and (vil) A mixture of ammonia and air at about in the presence of Pt gauze
   • (a) N20 (b) NO (c) NH20H compound is related to Haber’s process
   • (ix) ------------------ is the most explosive
   • (x) does not exist in free form
   • (xi) An aqueous solution of borax is
   • (xii) not a borane
   • (xiii) ------ can be obtained from aliphatic primary amine and ketone
   • (xiv) Gattermann-Koch formylation uses a mixture of
   • (xv) ----- is formed during the synthesis of 2-pentanone from ethyl
   • (xvi) Alkyl groups make the carbon in the carbonyl group
   • (a) -NO2 and (b) -OH and -CN may be obtained by treating one mole of Grignard reagent with
   • (B) State whether the following statements are true or false. (any three) 3
   • (i) Chlorination of toluene is an example of reversible reaction A homogeneous mixture consists of a single phase
   • (iii) There are two bridging hydrogen atoms in diborane
   • (iv) released by heating The hybridization of ‘C’ and ‘O’ in carbonyl group is
   • (vi) Aldehydes are typically more reactive than ketones
   • (C) Match the column. (any five) 5
   • (vi) Knoevenagel condensation (f) Atoms and free radicals
4. Q2 Attempt any four of the following. 20 marks
   • (A) Explain with suitable examples, what is meant by consecutive reactions and
   • (B) Give an expression for the rate constant of a bimolecular reaction in terms of the
   • (C) If the rate of reaction approximately doubles when temperature rises from to calculate the energy of activation of the reaction. [R =
   • (D) State and explain Nernst distribution law. What are the conditions under which the law is strictly valid ?
   • (E) State and explain Raoult’s law. Draw vapour pressure — composition curve and explain positive and negative deviation from Raoult’s law
   • (F) mixture of water and aniline boils at a temperature of 88.6 at pressure of 1.013 X The vapour pressure of water at this temperature is 8.688 X 104 Find the composition of the distillate Attempt any four of the following. 20
   • (A) Which is considered as strong Lewis acid, BF3 or BCl3 ? Explain
   • (B) Draw the structure of tetraborane. Explain various bonds involved in the structure Calculate total number of electrons involved in the bonding
   • (C) Write one method of preparation of SiCl4. Explain its structure and bonding
   • (D) With a diagram, explain Czochralski pulling technique for purification of silicon
   • (E) Name, formulate the hydrides of nitrogen family. Explain trend for their thermal
   • (F) Write a note on Bosch-Haber process
5. Q4 Attempt any four of the following
   • (A) Explain the mechanism of Benzoin condensation. 5
   • (B) How will you obtain and from 1i) Discuss the reduction of 3-pentanone by using NaBH4. 2
   • (C) 1) Give the Mechanism of base catalyzed enolisation. 3 1i) How is secondary alcohol obtained from Grignard reagent. 2
   • (D) i) Explain the general mechanism of acid catalyzed nucleophilic addition to 3
   • ii) Explain the preparation of cyclic acetal from ethanal. 2
   • (E) Give preparation of: 5
   • i) 2-pentanone from acetyl acetone 1i) succinic acid from ethyl acetoacetate
   • (F) 1) How are aldehyde and ketone obtained by hydration of alkyne? 3
   • ii) What are stabilized enols? 2
6. Q5 Attempt any four of the following
   • (A) Compare the collision theory with the activated complex theory highlighting the 5 relative merits of each theory
   • (B) What are partial miscible liquids? Explain the term “lower critical solution 5
   • (C) What is borax? Explain any two methods used for its synthesis. 5
   • (D) What is silica? Explain its structure and bonding. Why is it inert? 5
   • (E) Explain the mechanism of Cannizzaro reaction. 5
   • (F) 1) Write note on Rosenmund reduction. 3 1i) Discuss the reduction of 2-butanone by using 2

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