B.Sc. V - Semester Examination

CBS-Vs/5 (R&P) 27981

CHEMISTRY

Course No.: UCHTE - 501

Time Allowed-2½ Hours                                                                                   Maximum Marks-80

SECTION-A

Answer all questions.      (5×3=15)

1. What is isotopic substitution?

2 What is actinometry?

3. Write the chemical formula of sodium nitroprusside. Write its two chemical properties.

4. What is a hot band?

5. Complete the following reaction. Write two physical properties of B.

2K₂ MnO₄ +Cl₂→ A+B        (1+2)

SECTION - B

Answer all questions.          (5x7=35)

6. What are overtones? Give reasons for appearance of overtones in vibration spectroscopy? (2+5)

7. What is Lambert Beer's law? Explain molar absorption coefficient.        (5+2)

8. Draw molecular energy level diagram of ferrocene.

9. How second law of photochemistry is used to explain quantum yield?

10. Which metal is present in chlorophyll and how this metal is responsible for photo behavior of chlorophyll?

SECTION-C

Answer any two questions.       (2×15=30)

11.  a). Write a small note on magnetic susceptibility of diamagnetic substances.

      b) Explain Clausius - Mossotti equation.

12. Explain with three examples effective atomic number (EAN) rule in mononuclear carbonyls having metallic atom with even atomic number.

13. a) What is induced dipole moment?

      b) Write a small note on biological functions of the below mentioned elements in biological systems.

i) Na⁺

ii) Mg²⁺

iii) K⁺  

iv) Ca²⁺

14. a) Write a note on laws of photochemistry.

      b) Explain examples of low and high quantum yields.

15. Explain briefly the following

i) Ferromagnetism.

ii) Quenching.

iii) Optical activity.      (3´5)

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B.Sc. V - Semester Examination

BS-VS/11

228866

CHEMISTRY

Course No.: 501

Time Allowed: 3 hours                                                                           Maximum Marks: 80

Note: Attempt all questions from Section A and Section B and any three questions from Section C.

Section-A

1. What is Van't Hoff equation? Why is it so called?

2. What is meant by triple point of water? Why is it different from the normal melting pointing of ice?

3. What is solubility product? Give its applications.

4. Enlist the applications of concentration cells.

5. List the important observations of photoelectric effect.

6. List the various conditions which an eigen function must satisfy.

7. What are the advantages of Raman Spectroscopy over Infrared Spectroscopy?

8. How is the pure rotational spectrum be used in the calculation of bond length?

9. Discuss between thermal and photochemical processes.

10. What is magnetic susceptibility? How is it related to magnetic moment?

(2×10)

Section-B

1. Define the law of chemical equilibrium. How can it be derived thermodynamically? (1, 5)

OR

Explain the following terms using diagrammatic sketch:  (3, 3)

a) Eutectic point

b) Invariant system

2. How does equivalent conductance of an electrolyte vary with dilution?  (6)

OR

Describe the standard hydrogen electrode. (6)

3. State and explain Compton Effect. (6)

OR

Derive an expression for eigen function and eigen value for a particle in one-dimensional box.

4. What is molecular spectroscopy? How does it differ from atomic spectroscopy? Draw the molecular energy levels of first two electronic levels.  (6)

OR

Write notes on:

a)  Frank-Condon principle

b) Born-Oppenheimer approximation

(3, 3)

5. State and explain Stark-Einstein law. (6)

OR

What information can dipole moment give about the structure of a molecule? Give examples.  (6)

Section-C

1. Draw a labelled phase diagram for sulphur system. Explain clearly the main points of information about the equilibria represented in various areas, along with different lines and at various points of the diagram. (2, 8)

2. What are reversible and irreversible cells? Explain each of them with a suitable example. (5, 5)

3. a) Explain the various postulates of quantum mechanics.

    b) Evaluate the commutator [d/dx, d²/dx² ].

(8, 2)

4. a) Derive an expression for the frequency of the rotational lines in the pure rotational spectrum.

    b) Calculate the rotational constant of H-Cl. The H-Cl bond length is 136 pm.

(7, 3)

5. What do you understand by the electrical polarization of molecules? Derive Clausius-Mosotti equation. (10)

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B.Sc. VI Semester Examination

BS-VIS/5
26547

CHEMISTRY

Course No. : 601

(Organic Chemistry)

Time Allowed-3 Hours                                                                     Maximum Marks-80

Section – A (Very Short Answer Type Questions)

Note: Attempt all ten questions. Each Question carries 2 marks.

1. What are chromophores? Give one example.

2. Define chemical shift.

3. Give one method of synthesis of Grignard reagent.

4. What is Zeigler - Natta catalyst?

5. Write down the product of the following reaction:

6. What is hydroboration?

7. Write down the molecular orbital diagram of Thiophene.

8. Write down the structure of Indigo.

9. Define electrophoresis.

10. What are glycosides? Give one example.

Section – B (Short Answer Type Questions)

Note: Attempt five questions one from each unit. Each question is of 6 marks.

UNIT-I

11. How will you distinguish between aldehydes and ketones using IR spectroscopy?

12. Define coupling constant. Discuss its significance in distinguishing between cis- and trans- stilbene.

UNIT-II

13. Write down the product along with mechanism of the following reaction:

14. Give two methods of synthesis of ethyl acetoacetate.

UNIT-III

15. What are phase transfer catalysts? Give one example of a reaction catalyzed by these catalysts.

16. Discuss the conformational analysis of mono-substituted cyclohexanes.

UNIT-IV

17. Among pyridine and pyrrole, which one is more basic and why?

18. Give one method of the synthesis of methyl orange.

UNIT-V

19. How will you carry out the selective hydrolysis of peptides?

20.  What is mutarotation? Discuss its mechanism.

Section – C (Long Answer Type Questions)

Note: Attempt three questions. Each question is of 10 marks.

21. Calculate λ_max (π – π^*) of the following compounds using Woodward - Fieser rules:

22. Write down the product along with mechanisms of the following reaction:

23. Write short notes on the stereochemistry of E2 anti-eliminations.

24. Write down the product and give the mechanism of the following reaction:

25. How will you prepare glucosazone? Give mechanism of its formation.

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