AU Degree 5th Sem Chemistry Paper - VI (2108) Question Paper

Andhra University Degree 5th Semester Chemistry Paper - VI Question Paper of the year 2108 is below.

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Year - 2018

ANDHRA UNIVERSITY

B.Sc. Degree Examination:

(Examination at the end of Semester - V)

CHEMISTRY

Inorganic, Organic and Physical Chemistry

Time:3Hours]     [Max: 75 Marks

Part - A (5x5=25 Marks)

Answer any Five from the following eight questions.
Each question carries 5 marks 
1. Explain the biological significance of magnesium.
2. State and explain laws of photochemistry.
3. Explain Arrhenius equation. Write about activation energy of a reaction.
4. Write Paul-knorr synthesis.
5. Write about the formation of osazones from glucose and fructose.
6. Explain Ruff degradation.
7. Write the synthesis of valine and leucine.
8. Write about the nomenclature of proteins with examples.

(5x10=50Marks)

Answer any Five questions. Choose One from each Unit.
Each question carries 10 marks

Unit - I

9. (a) Discuss the structure and functions of Chlorophyll.
                       (Or) 
(b) Explain the mechanism of SN1 substitution reactions in square planar complexes with examples.

Unit - II

10. (a) Derive rate constant for a second order reaction with example.
                      (Or) 
(b) Explain the Hydrogen-Bromine photochemical reaction mechanism.

Unit - III

11. (a) Discuss the nitration and sulphonation mechanism in pyrrole under mild conditions.
                     (Or) 
(b) Explain the structure and aromatic nature of pyridine make a comparison with pyrrole.

Unit - IV

12. (a) Give evidence for the cyclic structure of glucose. Explain Hayworth formula of glucose.
                    (Or) 
(b) Explain the interconversion of aldohexose to Aldo pentose.

Unit - V

13. (a) Discuss the classification of alpha amino acids into acidic, basic and neutral nature with examples.
                  (Or) 
(b) Explain the structure and nomenclature of peptides with examples. 

Year - 2017

ANDHRA UNIVERSITY

B.Sc. Degree Examination 

(Examination at the end of Semester - V)

Part Il: CHEMISTRY 

Paper-VI: Inorganic, Organic and Physical Chemistry 

Time : 3 Hours]      [Max: 75 Marks

Part|| A] (5 x5 = 25 Marks)

Answer any Five from the following eight questions.
1. Define the terms ‘inert complex’ and ‘outer complex’. Give one example each.
2. How does Haemoglobin act as carrier of oxygen?
3. Explain the terms Molecularity and order of a reaction.
4. What is the effect of temperature on reaction rates ?
5. How is quantum yield determined experimentally?
6. Explain why pyridine undergoes electrophilic substitution at 3-position.
7. What is peptide bond? Explain with suitable examples.
8. How do you distinguish Glucose from Fructose?

(5x 10=50 Marks)

Answer All questions.
Each question carries 10 marks
9. (a) Explain SN1 and SN2 substitution reactions of square planar complexes with examples.
(Or)
(b) Give an account on the biological importance of Na⁺, Ca⁺², Mg⁺², Ni⁺², Zn⁺² and Cl^- ions in the biological systems.

10. (a) Derive an expression for the rate constant of a first order reaction. Give two examples for first order reaction.
                     (Or)
(b) Explain the following
(i) Thermal and photochemical processes.
(ii) Photochemistry of H₂—Cl₂ and H₂—Br₂ reactions.
(iii) Photosensitization.

11. (a) Give an account on the aromaticity of furan, thiophene, pyrrole and benzene.
                     (Or) 
(b) How will you prepare the following compounds from pyrrole and write the mechanisms.
(i) 2-Nitro pyrrole.
(ii) 2-Acetyl pyrrole.
(iii) 2-Formyl pyrrole.

12. (a) Establish the structure of D-Glucose.
                   (Or) 
(b) How will you convert.
(i) Aldohexose to aldopentose.
(ii) Aldose to its epimer.

13. (a) Explain the following methods of synthesis of α - amino acids.
(i) Strecker synthesis.
(ii) Gabriel phthalimide synthesis.
(iii) Koop synthesis.
                   (Or)
(b) Describe the structure of proteins.