(DCHE 01) M.Sc. DEGREE EXAMINATION, DECEMBER 2011. First Year Chemistry Paper I GENERAL CHEMISTRY Time : Three hours Maximum : 100 marks PART A (4 10 = 40 marks) Answer any FOUR questions. 1. Explain the allowed transitions between rotational energy levels. What do you understand by quantization of energy? 2. Discuss the microwave spectroscopy of linear molecules with suitable examples. 3. Explain the classification of bands in UV and visible spectroscopy. 4. Write about different sources and detectors used in IR spectroscopy. 5. What are significant figures? Write the rules for their computation.
6. Write an account of linear least square treatment of data and its use in analysis. 7. Write an account of DOS. 8. What is meant by algorithm? Write the significance of flow chart symbols used in FORTRAN. PART B (4 15 = 60 marks) Answer ALL questions. 9. (a) Describe the instrumentation, principle and applications of ESR spectroscopy. Describe the applications and principle of Microwave spectroscopy. 10. (a) What is meant by harmonic oscillator model? Explain vibrational rotational spectra in infrared spectroscopy. Describe the instrumentation, principle and applications of UV Visible spectroscopy. 2 (DCHE 01)
11. (a) Write an account of student t test and f test. Write an explanatory note on control charts and confidence interval. 12. (a) Describe the various steps involved in the program solving. What are the functions of GOTO and DATA statements? Write their syntax rules. 3 (DCHE 01)
(DCHE 02) M.Sc. DEGREE EXAMINATION, DECEMBER 2011. First Year Chemistry Paper II INORGANIC CHEMISTRY Time : Three hours Maximum : 100 marks PART A (4 10 = 40 marks) Answer any FOUR questions. 1. Explain the terms photoelectric effect and compton effect. 2. Explain Heisenberg's uncertainty principle and orthogonality theorem. 3. Write the important features of valence bond theory and its approach to H2 molecule. 4. What is hybridization? Describe different types of hybridization with suitable examples. 5. What is meant by crystal field stabilization energy (CFSE)? Explain the magnetic properties of transitional metal ions.
6. Explain Jahn-Teller effect on co-ordination complexes. 7. Discuss the labileness and inertness of complexes based on valence bond theory. 8. Describe the synthesis and properties of silicones. PART B (4 15 = 60 marks) Answer ALL questions. 9. (a) Write and explain the wave equation for hydrogen atom and its application for the determination of ground state energy of hydrogen atom. What are term symbols? Discuss the atomic spectra of alkali metals. 10. (a) Define lattice energy. Explain Born Haber cycle and discuss the structure of NaCl. What are salient features of M.O. theory. Explain the LCAO approach and energy level diagram of oxygen molecule. 2 (DCHE 02)
11. (a) Discuss the factors affecting the stability of complexes. How can you determine the stability of complex by ph methods? What are orgel diagrams? Discuss the electronic spectra of complexes with suitable complexes. 12. (a) By taking suitable examples explain the ligand substitution by SN 1 reaction mechanism in square planar complexes. What are metal nitrosyls? Discuss the structure and bonding in nitrosyls. 3 (DCHE 02)
(DCHE 03) M.Sc. DEGREE EXAMINATION, DECEMBER 2011. First Year Chemistry Paper III ORGANIC CHEMISTRY Time : Three hours Maximum : 100 marks PART A (4 10 = 40 marks) Answer any FOUR questions. 1. Define and explain the words : (10) (a) (c) Cross conjugation Hyper conjugation Tautomerism. 2. (a) Write a brief notes on elements of symmetry. (7) Define threo and erythro isomers with suitable examples. (3) 3. (a) Write a short note on isotopic effect. What is Hammett equation? Write its significance in the organic reactions. (10)
4. Describe the role of Neighbouring group participation in a nucleophilic substitution reactions. (10) 5. (a) Explain, Diazonium coupling reactions with suitable examples. (5) Write a note on Gattermann - Koch reaction. (5) 6. (a) What is Hydroboration reaction with mechanisms? (5) Write a note on NBS. (5) 7. What are wittig and perkin reactions write their mechanism? (10) 8. (a) What is an Aldol-condensation reaction with different carbonyl compounds an examples? (5) Write a brief note on Hydrolysis of Esters. (5) PART B (4 15 = 60 marks) Answer ALL questions. 9. (a) Write a short note on (i) Aromaticity (ii) Homo-aromaticity with a suitable examples. (9) (iii) Describe Nobond resonance ; and why 3 -carbonium ions are more stable than 2, and 1 -carbonium ions. (6) 2 (DCHE 03)
(i) Explain the stereochemistry of biphenyls, allenes and spirans. (12) (ii) Write a note on optical purity. (3) 10. (a) (i) Define carbene. Write their general methods of preparations; How many types of carbenes, write their structures and reactivities? (12) (ii) Write any two methods for formation of carbonion. (3) (i) Write a short note on SN2, SN1 and SNi mechanisms with a suitable examples. (10) (ii) What is anchimeric assistance explain? (5) 11. (a) (i) What is a free radical? Explain their preparations, structures and stabilities. (10) (ii) Write a short note on Sandmayer reaction. (5) (i) Describe the following NBS and Hundiecker reaction. (10) (ii) Write a note on orientation of electrophilic substitution on ring systems. (5) 3 (DCHE 03)
12. (a) (i) What is -elimination reactions? Describe E2, E1 and E1CB mechanisms with a suitable examples. (12) (ii) Write a note on Hoffmann elimination with an example. (3) Write a short note on the following : (i) Benzoin condensation. (5) (ii) Perkin reaction and (5) (iii) Manmich reaction. (5) 4 (DCHE 03)
(DCHE 04) M.Sc. DEGREE EXAMINATION, DECEMBER 2011. First Year Chemistry Paper IV PHYSICAL CHEMISTRY Time : Three hours Maximum : 100 marks PART A (4 10 = 40 marks) Answer any FOUR questions. 1. Define entropy and discuss the entropy changes in reversible and irreversible processes. 2. What are Gibbs free energy and Helmhotz free energy and write the variation of G with pressure, temperature and volume? 3. What is radioactive decay and explain the nuclear stability? 4. Write the applications of radio isotopes in agriculture and medicine. 5. Define cell emf and how it is measured. 6. Define transport number and how it is determined.
7. Discuss in detail about photochemical process. 8. Derive Stren-Volmer equation for quenching of fluorescence. PART B (4 15 = 60 marks) Answer ALL questions. 9. (a) Derive Classius-Clayperon equation. Write and explain the terms involved in Gibbs- Duhem equation. Write notes on : (i) (ii) Partial molar quantity and Vant Hoff's reaction isotherm. 10. (a) Describe the detection of various types of nuclear radiations using detectors. Define the terms Unit cell and Lattice energy. Write a detailed note on crystal defects. 11. (a) Derive an equation for EMF of a cell with transference. Derive Deby-Huckel-Onsagar equation. 2 (DCHE 04)
12. (a) Explain the kinetics of consecutive and chain reaction. Write note on : (i) (ii) Heterogeneous catalysis Laws of photochemistry. 3 (DCHE 04)