Guru Nanak Dev University 2005-3rd Sem B.Sc Chemistry ORGANIC OF FUNCTIONAL GROUPS-III (Chem-302) (, 2k5) - Question Paper

5412
B.Sc. (H.S) in Chemistry third Semester
2125
PAPER - Chem-302

Organic Chemistry of Functional Groups-III

Time Allowed : three hours
Maximum marks : 75

Note : Attempt all ques. from Section-A. 8 ques. from Section-B and 2 ques. from Section-c

part - A
10 x 1½ = 15

1.
(a) What is saponification and iodine value of oils? discuss briefly.

(b) elaborate reducing and nonreducing sugars? provide examples of every kinds.

(c) elaborate the phase transfer catalysts. provide examples.

(d) Write the structure of enantiomers of -D-(+)-Glucose.

(e) elaborate carbohydrates? provide their classifications illustrating an example

(f) What is solid phase synthesis of peptides? discuss.

(g) elaborate ribonucleotides? Write the structure of uridylic acid.

(h) elaborate Ir-active and IR-inactive bonds? Illustrate with examples.

(i) provide the expected absorption bands (IR Region) for the following:-
(i) Hexane
(ii) 1-Hexane
(iii) 1-Hexyne.

(j) elaborate auxochromes? provide suitable examples mentioning the cause for their functioning as auxochromes.


part - B
4½ x eight = 36

2. describe Beer-Lambert legal regulations. explain absorption of light by a solution and measurement of absorption intensity.

3. explain briefly the kind of molecular vibrations in Infrared spectroscopy. How C-H stretching varies with the kind of hybridization of Carbon?

4. explain Gabriel synthesis of primary amines. How would you prepare
(i) Benzyl amine
(ii) 1-Hexanamine
Why aniline cannot be prepared by this method?

5. Show how would you convert p-anisidine to
(i) p-fluoro toluene
(ii) Iodobenzene.
(iii) Tollunitrile

6. What type of saccharide is sucrose? Does it show mutarotation? provide its chair structure and IUPAC names. Is it a reducing or non-reducing sugar?

7. define how a mixture of primary, secondary, tertiary amines can be separated.

8. elaborate glycosides? Why are they called non-reducing sugars? explain their preparation.

9. define briefly mutarotation. What other carbohydrates other than D-Glucose indicates mutarotation?

10. explain D- and L- configurations of carbohydrates. Write the structurtes of D- and L- threose.

11. What is Edmann degradation of peptides? provide equations for reaction with tetrapeptide Ala. Gly. Thr. Leu. What is the advantage of this degradation?

12. elaborate deoxyrhibonucleic acids (DNA)? Show how the bonding is current in the primary structure of DNA.

13. elaborate enzymes? Briefly explain their specificity. How these are various from inorganic catalysts?


part - c

14. (a) elaborate proteins? Classify them on the basis of shape and biological activity. provide an example of every kind.
(b) define the kind of bonding responsible for their tertiary and quaternary structures.
(c) discuss why the helical coil of a protein terninates at proline always?
(d) Write a short notes on denaturation of proteins. (4,4,2,2,)

15. (a) explain double stranded structure of DNA. provide the significance of base pairing.
(b) define briefly the synthesis of amino acids by Strecker' method.
(c) explain synthesis of peptides. Mention the main protecting group of acids and amines. How many tripeptides are possible from 3 amino acids? (4,4,4)

16. refer to attachment

17. refer to attachment.

Earning:   Approval pending.