BCHCT135 EM 2023 SOLVED ASSIGNMENT

Description

ASSIGNMENT
Solutions, Phase Equilibrium, Conductance, Electrochemistry & Functional
Group Organic Chemistry-II
Core Course in Chemistry
Course Code: BCHCT-135
Assignment Code: BCHCT-135/TMA/2023
Note: Attempt all questions. The marks for each question are indicated against it.
Maximum Marks: 100
PART-(A) (50)
1. (a) What are ideal solutions? Give two examples of such solutions.
(b) Draw and explain the vapour pressure curves for an ideal solution.
(2)
(3)
2. Draw and explain the mutual solubility curve for the phenol-water system. (5)
3. (a) How do the impurities Affect the CST values? Explain.
(b) Explain the stability of different phases of a pure substance in terms of chemical potential versus
temperature curves.
(2)
(3)
4. Define any five of the following terms:
(i) Phase
(ii) Azeotropes
(iii) Congruent melting
(iv) Concentration cell
(v) Conductometric titration
(vi) Galvanic cells
(5)
5. (a) What is the criterion for phase equilibrium for a heterogeneous system at constant pressure and
temperature?
(b) Define components in the context of phase rule. Calculate the number of components for the
sublimation equilibrium of NH4Cl assuming that NH (g) 3
and HCl (g) are produced from the
sublimation of NH Cl( ) 4
s only.
(2)
(3)
6. (a) What is the triple point for a one component system? What is the degrees of freedom at the
triple point?
(b) Draw and explain the phase diagram for a simple eutectic system and give an industrial
application for the same.
(2)
(3)
7. (a) Define molar conductivity and give its significance.
(b) In a conductivity cell, the two platinum electrodes, each having an area of 2 cm2
are 1 cm apart.
Using this cell the resistance of a 0.1 M solution of acetic acid is found to be 470Ω. Calculate the
molar conductivity of the solution.
(2)
(3)
8. (a) List the requirements for an electrolyte to be indicator electrolyte in the moving boundary
method for the determination of transference numbers’
(b) In the determination of transference numbers of HCl by moving boundary method a 0.10 M
solution of HCl was taken in a cell having uniform area of cross section of 1.0 cm2
. At the end of
experiment the boundary moved by 10.3 cm and 0.132 g of silver was deposited on the cathode of
silver coulometer. Calculate the transference numbers of ions of HCl.
(2)
(3)
9. (a) Differentiate between reversible and irreversible cells. (2)
4
(b)Write the cell diagram for a galvanic cell in which the following reaction takes place.
Sn(s) + 2 Ag+
(aq)  Sn2+(aq) + 2 Ag(s)
Assume that potassium nitrate is used as electrolyte in the salt bridge and the concentrations of tin
ions and silver ions are c1 and c2 respectively.
(3)
10. (a) Define electrolysis. Name the gases evolved in the electrolysis of brine.
(b) Define liquid junction potential and describe its development.
(5)
PART-(B) (50)
11. Discuss the mechanism of Hell-Vohlard-Zelinsky reaction. (5)
12. Write the mechanism and the products formed for the following reactions: (5)
CH3
– C – Cl and CH3NH2
O
(i) Reaction between
(ii) Reaction between C2H5
– C – Cl and (CH3
)3N
O
(5)
13. (a) Give the IUPAC names of the following compounds:
(i) CH3
– CH – CH2
– CH2NH2
NH2
(ii) CH3
– N
CH2CH3
CH2CH3
(b) Briefly explain the following reactions:
(i) Hofmann rearrangement
(ii) Schmidt rearrangement
(2)
(3)
14. (a) How will you prepare the following compounds? Give reactions.
(i) 4-methylbiphenyl
(ii) 4-hydroxyazobenzene
(iii) butter yellow dye
(b) How will you convert 4-bronobenzenmine to 4-bromobenzenol?
(3)
(2)
15. (a) Discuss the nitrosation reaction of primary amines.
(b) Discuss the nitration reaction of aniline. How would you account for the formation of different
products?
(3)
(2)
16. (a) What is electrophoresis? Briefly explain. Also give its importance.
(b) What BOC-group? Which reagent is used to introduce this group?
(3)
(2)
17. How will you synthesise valine using Gabriel phthalimide synthesis? (5)
18. Discuss the secondary structure of peptides. (5)
19. (a) Briefly explain the phenyl osazone formation by monosaccharides.
(b) Why do D-(+)-glucose and D-(+)-mannose give the same osazone?
(3)
(2)
20. (a) What are polysaccharides? Give examples.
(b) Briefly explain the structure aspects of starch.