BSc Chemistry SEM III ATKT 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) Nitration of aniline is an example of -------- reaction
   • (ii) The plot of logiok v/s is linear with a slope of
   • (iii) The correct form of Arrhenius equation is
   • (iv) ---------- is the mixture of an ideal solution
   • (a) and (b) and CHCl and
   • (v) The ---------- mixture of two or more components is termed as solution
   • (vi) The organic liquids which are steam volatile and immiscible with water can be separated by (Vil) -------------- the electron deficient compound
   • (viii) The tendency of BF3 , BCl; & BBr3 to behave as lewis acid decreases in
   • (ix) incorrect statement as far as structure of diborane is
   • (a) “There are two bridging hydrogen atoms in diborane.’
   • (b) “The hydrogen atoms are not in the same plane in diborane.’
   • (c) ‘All B-H bonds in diborane are similar.’
   • (x) Non - Combustible
   • (xi) ------------ is not hydrolysed (xil) The least stable hydride of 15" group
   • (xiii) ------ can be obtained from aromatic primary amine and aldehyde
   • (c) Pyridinium chlorochromate
   • (xv) malonate is
   • (xvi) The correct order of reactivity is
   • (xvii) | are (xviii) on hydration gives State whether the following statements are true or false. (any three) 3
   • (i) The rate of reaction is inversely proportional to its energy of activation
   • (ii) — water system is an example of upper critical solution temperature, a hydride of boron Borax is basic in nature
   • (v) Alkyl groups make the carbon in the carbonyl group less electrophilic the carbonyl group, both C and O are sp” hybridized
   • (C) Match the column. (any five) 5
   • (i) (a) Group 13 element
   • (iv) As (d) Partially miscible with upper and
   • (v) Benzoin condensation (e) Self condensation of aromatic aldehyde having no a - H atom
   • (g) Self condensation of aromatic
   • (h) Parallel reaction
4. Q2 Attempt any four of the following. 20 marks
   • (A) Explain with suitable examples what is meant by reversible reactions and parallel
   • (B) What are the drawbacks of the collision theory of reaction rates
   • (C) The energy of activation of a bimolecular reaction is 83.5kJmol'. Calculate the fraction of molecules reacting at (R = 8.314
   • (D) What is steam distillation? Describe it with a neat labeled diagram
   • (E) Draw vapour pressure — composition diagrams. Explain positive and negative deviations from Raoult’s law
   • (F) liquid A was found to distil freely in steam at a temperature of When the atmospheric pressure was 9.812 X The vapour pressure of pure water at this temperature is 8.551 X 10* Nm”. The distillate contained 53 % by weight of the immiscible liquid A. Calculate the molecular weight of liquid A
5. Q3 Attempt any four of the following. 20 marks
   • (A) Draw the structure of BF3. Why does it called Lewis acid ? Write its any three
   • (B) What is borax? Explain any two methods used for its synthesis
   • (C) Write a note on purification of germanium by any one method
   • (D) What is atomic number of silicon ? What is its electronic configuration ? What is its position in the periodic table? Name any two compounds of silicon
   • (E) Name and formulate any five oxides of nitrogen. Find oxidation state of nitrogen in each of them
   • (F) suitable diagram, explain the synthesis of ammonia by Bosch — Haber
6. Q4 Attempt any four of the following
   • (A) Explain the mechanism of Knoevenagel condensation. 5
   • (B) Write note on Gattermann — Koch formylation. 3 Discuss the reduction of crotonaldehyde by using 2
   • (C) 1) Give the Mechanism of base catalyzed enolisation. 3
   • ii) How is tertiary alcohol obtained from Grignard reagent. 2
   • (D) 1) Explain the general mechanism of nucleophilic addition to carbonyl compound. 3
   • ii) Explain preparation of cyclic ketal from propanone. 2
   • (E) Give preparation of: 5
7. Q1 propanoic acid from ethyl acetoacetate
   • ii) 2-pentanone from acetyl acetone
   • (F) i) Write note on Rosenmund reduction. 3
   • ii) What are stabilized enols? 2
8. Q5 Attempt any four of the following
   • (A) Discuss the activated complex theory of reaction rates. 5
   • (B) State and explain Nernst’s distribution law. What are its important applications? 5
   • (C) Draw the structure of tetraborane. Explain various bonds involved in the structure. 5 Calculate total number of electrons involved in the bonding
   • (D) is silica ? Explain its structure and bonding. Why is it inert? 5
   • (E) Explain the mechanism of Cannizzaro reaction. 5
   • (F) Write note on Friedel Craft acylation of arenes. 3 Discuss the reduction of p- nitrobenzalehyde by using 2

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