BSc Chemistry SEM III ATKT 2017-18 ATKT Chemistry Paper II Question Paper - Mumbai University | munotes

Questions asked in this paper

1. Q2 Answers to the same question must be written together
2. Q3 Figures to the right indicate full marks
3. Q4 The use of log table non-programmable calculator is allowed
4. Q1 (A) Select the correct option and complete the following sentences : 12 marks
   • (1) Decomposition of ethylene oxide is an example of reaction
   • (ii) The correct form of Arrhenius equation is
   • (a) = Ae
   • (iii) Which of the following shows positive deviation from Raoult's law?
   • (iv) The conditions for an ideal solution are and
   • (v) Borax is synthesized from
   • (vi) In silica, central atom silicon undergoes hybridization
   • (vii) gas when inhaled in moderate quantities produces hysterical
   • (a) NO (b) N,O (c) NO, Except , all the elements of group 15 form pentahalides
   • (ix) The combination can not undergo Claisen-Schmidt reaction
   • (x) The solvents favour enol formation
   • (a) polar and protic
   • (b) non-polar and aprotic
   • (c) polar and aprotic
   • (xi) Cyanohydrin has groups
   • (a) and -OH (b) -CNand-NH, (c) and -NO,
   • (a) (b) >C=O (c) >C=O and
   • (B) State whether the following statements are true or false : 3
   • (i) Phenol - Water system is an example of lower critical solution
   • (ii) Banana bond is a 3e — 2c bond If a compound contains both aldehyde and ketonic group, then the ketone is considered as the parent compound
   • (C) Match the following columns : 5
   • (i) Chain carriers (p) BF, (r) atoms and free radicals
   • (v) cyclohexane carbaldehyde
   • (w) carbaldehyde cyclohexane
5. Q2 (A) (i) Explain with suitable examples what is meant by : 5 marks
   • (a) parallel reactions
   • (b) reversible reactions
   • (11) State the important assumptions of the collision theory ofreaction rates. 3
   • (A) (i) Explain the terms "Upper critical solution temperature" and "lower critical
   • (ii) State and explain Raoult's law. 3
   • (B) An organic liquid was subject to steam distillation. The liquid inthe flask 5 boiled at The external pressure was found to be Nm” The vapour pressure of water at is Nm*. The ratio of the weights of liquid to water in the distillate was found to be 2.47 Calculate the molecular weight of the liquid Given : Molecular weight of water = 18 ]
   • (ii) A solution of two liquids A & B exhibits ideal behaviour. The mole 3 fraction of A is 0.4, the vapour pressure of the pure component A is and that of B is 0.3bar. Calculate the partial vapour pressure of A and B in solution
   • (B) (i) The rate constant of a reaction increases by 7%. When the temperature 5 is raised from 300 K to 310 K. Calculate the energy of activation of the
   • (ii) For the first order reaction, 4NO,,) + the frequency factor A is and Ea is 103.35 kJ What is the rate constant at
   • (C) Write a note on azeotropic mixtures. 4
   • (C) Give the merits of collision theory. 4
   • (i) What are electron deficient compounds? Discuss bonding in diborane 5
   • (11) Draw the structure of tetraborane molecule and calculate the total number 3 of electrons involved
   • (A) Discuss the Czochralski's pulling technique for preparation of single 5 crystals of germanium
   • (ii) Name the elements of group 14. Give their electronic configuration. 3
   • (B) (i) How is silicon tetrachloride prepared? Discuss structure and bonding 5 involved in silicon tetrachloride
   • (11) Draw and describe the structure of silica. 3
   • (B) (i) Discuss the preparation, properties and structure of nitric oxide. 5
   • (ii) Give a brief account of halides of group 15 elements. 3
   • (C) With reference to elements of boron family, explain the trend inthe following: 4
   • (1) atomic radii and ionization energy melting and boiling points
   • (C) Explain the following : 4
   • (1) Ammonia is highly soluble in water but other hydrides are less soluble
   • (ii) NO, is coloured, while N,O, is colourless
   • (i) Explain the mechanism of Cannizzaro reaction. 5
   • (11) Give preparation of propanoic acid from ethyl acetoacetate. 3
   • (A) (i) (a) Write a note on Rosenmund reduction. 3
   • (b) What are stabilised enols? 2
   • (ii) How will you obtain 2-pentanone from acetyl acetone? 3
   • (B) (i) (a) Discuss the preparation of aldehydes and ketones by oxidation of 3
   • (b) Discuss the reduction of crotonaldehyde by using LiAIH 2
   • (ii) Give the mechanism of acid catalysed enolisation. 3
   • (B) (i) (a) How will you obtain C,H,COCH,, C,H,COC,H, and C,H,COCH,C,H, 3 from benzene using Friedel-Craft's acylation?
   • (b) Explain with reaction what happens when cinnamaldehyde isadded 2
   • (ii) Discuss the general mechanism of acid catalyzed nucleophilic addition 3 to carbonyl group
   • (C) Give the preparation of acetal and cyclic ketal. 4
   • (C) Complete the following reactions and find A and B : 4
   • (iii) + NaHSO, > A
6. Q5 Attempt any four of the following :
   • (A) at of 1 the number of AB molecules colliding per second is Ifthe activation energy of the reaction, Calculate the number of AB molecules reacting per cm? per second
   • (B) State and explain Nernst Distribution law. 5
   • (C) Howis borax prepared from Colemanite mineral? Discuss the properties 5 and uses of borax
   • (D) With respect to manufacture of ammonia by Haber's process, explain 5 the following physicochemical principles
   • (i) Effect of temperature
   • (ii) Effect of concentration
   • (E) Explain the mechanism of Benzoin condensation. 5
   • (F) Give the IUPAC name of CH,CHO, give its preparation from ethyne. 5 What happens when C,H,CHO is treated with CH, - CH, - Mg - Br and the product obtained is further hydrolysed?

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