Exam Details
| Subject | Organic Reaction Mechanism | |
| Paper | ||
| Exam / Course | Bachelor Degree Programme(Elective Course: Chemistry) | |
| Department | School of Sciences (SOS) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | June, 2016 | |
| City, State | new delhi, |
Question Paper
No. of Printed Pages: 8 ICHE-061
BACHELOR OF SCmNCE (B.Sc.)
Term-End Examination
June, 2016
00467
CHEMISTRY CHE-06 ORGANIC REACTION MECHANISM
Time hours Maximum Marks: 50
Note: Answer any Jive questions. .All questions carry equal marks.
1. What is the difference between a nucleophile and an electrophile Give one example of each. Why is iodide ion a good nucleophile but a weak base? 5
Define Substitution and Elimination reactions. Give one example for each. Name the factors which influence reactivity in SN2 reaction. 5
2. State and explain Saytzeff's rule with an example. How is it different from Hofmann's rule? 5
How is a cis and a trans alkene prepared from alkynes Give the mechanism incase of trans product. 5
3. Define Molecular Rearrangement. Outline the mechanism of Hofmann rearrangement. 5
Give one method of generation of nitrene. Describe its structure and explain its stability. 5
4. Electrophilic substitution in pyrrole takes place preferably at 2-position. Explain giving resonating structures for 2 and 3 substituted
a-complexes. 5
Draw a schematic labelled potential energy diagram for a generalised aromatic electrophilic substitution reaction, namely: 5 <img src='./qimages/11885-4b.jpg'>
5. Discuss a plan for the synthesis of metachloroethyl benzene. 5
How is malonic ester prepared? Outline the conversion of malonic ester to succinic acid. 5
6. What are dyes? How are they classified on the basis of method of their application Give one example each for any two of the following: 5 Azo dyes
(ii) Xanthene dyes
(iii) Indigoid dyes Give one name as example for each of the following: Chain growth polymers
(ii) Step growth polymers
(iii) Copolymers
Write the structure of anyone of the above polymers. 5
7. What are pericyc1ic reactions List the various types of pericyclic reactions with an example for each type. 5
Write a short note on pinacol-pinacolone rearrangement. 5
8. How are the isotopic studies useful in determining the mechanism of organic reactions 5
Write the mechanism of any two of the following reactions 5
Perkin condensation
(ii) Wittig reaction
(iii) Michael addition
BACHELOR OF SCmNCE (B.Sc.)
Term-End Examination
June, 2016
00467
CHEMISTRY CHE-06 ORGANIC REACTION MECHANISM
Time hours Maximum Marks: 50
Note: Answer any Jive questions. .All questions carry equal marks.
1. What is the difference between a nucleophile and an electrophile Give one example of each. Why is iodide ion a good nucleophile but a weak base? 5
Define Substitution and Elimination reactions. Give one example for each. Name the factors which influence reactivity in SN2 reaction. 5
2. State and explain Saytzeff's rule with an example. How is it different from Hofmann's rule? 5
How is a cis and a trans alkene prepared from alkynes Give the mechanism incase of trans product. 5
3. Define Molecular Rearrangement. Outline the mechanism of Hofmann rearrangement. 5
Give one method of generation of nitrene. Describe its structure and explain its stability. 5
4. Electrophilic substitution in pyrrole takes place preferably at 2-position. Explain giving resonating structures for 2 and 3 substituted
a-complexes. 5
Draw a schematic labelled potential energy diagram for a generalised aromatic electrophilic substitution reaction, namely: 5 <img src='./qimages/11885-4b.jpg'>
5. Discuss a plan for the synthesis of metachloroethyl benzene. 5
How is malonic ester prepared? Outline the conversion of malonic ester to succinic acid. 5
6. What are dyes? How are they classified on the basis of method of their application Give one example each for any two of the following: 5 Azo dyes
(ii) Xanthene dyes
(iii) Indigoid dyes Give one name as example for each of the following: Chain growth polymers
(ii) Step growth polymers
(iii) Copolymers
Write the structure of anyone of the above polymers. 5
7. What are pericyc1ic reactions List the various types of pericyclic reactions with an example for each type. 5
Write a short note on pinacol-pinacolone rearrangement. 5
8. How are the isotopic studies useful in determining the mechanism of organic reactions 5
Write the mechanism of any two of the following reactions 5
Perkin condensation
(ii) Wittig reaction
(iii) Michael addition
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Subjects
- Biochemistry
- Inorganic Chemistry
- Organic Chemistry
- Organic Reaction Mechanism
- Physical Chemistry
- Spectroscopy