Bharathiar University 2007 B.Sc Chemistry VIII - -university question paper

Time :Three hours Maximum : 75 Marks


ans ALL ques. in every part


part A—(10 X 1=10) marks

select the accurate ans

1.Identify the achiral molecule
a)D-glyceroldehyde
b) L-glyceroldehyde
c) Fumaric acid
d)Lactic acid

2. Op[tical inactivity of meso-tartaric acid due to the presence of

a) Achiral centre
b) Plane of symmetry
c) chiral centre
d) Nonsuperimposibleility

3. Isicyanide is not the intermediate for ------ rearrangement
a) Hofmann
b) Curitus
c) Benzidine
d) Lossen

4. An oxime become amide in which rearrangement
a) Claisen
b) Cope
c) Curtius
d) Beckmann

5. Glucose, Manose pair is termed as
a) Epimers
b) Anomers
c)Enantiomers
d)mesomers

6. The monomeric aldose is
a) Fructose
b)Sucrose
c)Maltose
d) Arabinose
7. Among the a-amino acids the optically inactive 1 is
a) Glycine
b) Alanine
c) Serine
d) Valine

8. Protein on complete hydrolysis yields
a) CO2 + H2O
b) a-Amino acids
c) ß-Amino acids
d) Glucose

9. Identify the non-aromatic compound among the subsequent
a) Furan
b) Pyrrole
c) Pipperidine
d) Thophene

10. Skraup synthesis is connected with
a) Iso-Quinoline
b) Indole
C) Isatin
d) Quinoline

SECTION-B – (5 × five = 25)

11 (a). Assign R and S configuration of the subsequent compounds
(i) COOH

D NH2

Cl
CHO

(ii) Br OH

Cl
(or)
(b) describe the subsequent terms:
(i) Enantiomers.
(ii) Diastereomer
(iii) Chirality

12. (a) Predict the Product and Suggest mechanism

R2CO + NH3 H2SO4
(or)

(b) discuss the mechanism of Claisen Rearrangement

13 (a) With the example describe the subsequent terms.
(i) Anomers
(ii) Epimers
(or)

(b) Draw the structure of Maltose and sucrose

14 (a) provide the product found when alanine is treated with
(i) Ba(OH)2
(ii) HNO2
(iii)HCL
(or)

(b)Explain the classification of proteins based on their functions

15. (a) Pyridine indicates aromatic character- discuss this fact with molecular orbital picture

(or)

(b) provide the synthesis of Isoquinoline

part C – (5 × eight = 40)

16.(a) describe the term Racemization and resolution and provide 1 method for every
process.

(or)

(b) (i) With illustration discuss Asymmetric Synthesis
(ii) explain the optical activity exhibited by Allenes

17. (a) provide a comparative account of
(i) Hofmann
(ii) Curtius and
(iii) Lossen Rearrangements.

(or)

(b) (i) Predict the product and suggest mechanism

Me2 C(OH)-C(OH)HPh
(ii)Explain the mechanismof Benzilic and rearrangement


18. (a) Deduce the structure of Glucose
(or)

(b) Write a note on:

(i) Muta rotation
(ii) Kiliani- Fischer synthesis

19 (a) explain the Secondary Structure of Protein

(or)
(b) Explain:
(i)Gabrial synthesis
(ii) Strecker amino acid synthesis

20 (a) Complete the subsequent reactions

(i) Pyrrole +PhN2+Cl-
(ii) Furan + Maleic anhydride
(iii) Thiphene + HCHO + HCl
(iv) Pyridine + NaNH2

(or)

(b) How will you Synthesis the subsequent Compounds

(i) Quinoline
(ii) Indole

Earning:   Approval pending.