Exam Details
| Subject | stereochemistry | |
| Paper | ||
| Exam / Course | m.sc. chemistry | |
| Department | ||
| Organization | solapur university | |
| Position | ||
| Exam Date | April, 2018 | |
| City, State | maharashtra, solapur |
Question Paper
M.Sc. (Semester IV) (CBCS) Examination Mar/Apr-2018
Organic Chemistry
STEREO CHEMISTRY
Time: 2½ Hours
Max. Marks: 70
Instructions: Attempt in all five questions. Section I (question is compulsory. Attempt any two questions from Section II and any two questions from Section III. Answer to all five questions (from Section II, III) should be written in the one and same answer book. All questions carry equal marks. Figures to the right indicate full marks.
SECTION-I
Q.1.
Answer the following:
05
What is Re face and Si face?
What is ring flipping in cyclohexane?
Define chiral pool synthesis?
Define fused bicyclic compounds?
Define functional isomers?
B)Predict the product with stereochemistry.
SECTION II
Q.2
Discuss relative reactivity of distereomers in molecular elimination reactions?
07
Explain pyrolysis of cycloalkyldimethylamine oxides cycloalkyltrimethyl ammonium hydroxide in six membered and larger than six membered ring in details?
07
Q.3
What is distereoselectvity? What is distereoselective addition to carbonyl group? Explain via Felkin Ahn model.
07
Explain different isomers of perhydrophenanthrene and comment on its stability and chirality?
07
Q.4
Explain stability of cis and trans decalin and comment on their various physical properties?
07
What is enantioselective synthesis? Explain enantioselective synthesis via hydrazones?
07
SECTION III
Q.5
Define stereospecific reaction? Why Electrophilic epoxidation of alkenes are diastereospecific?
05
What is chiral reagent? What is synthesis of CBS reagent and its applications in enantioselective synthesis?
05
What is difference in the distereomers stability of Stilbene dichloride and Tartaric acid?
04
Q.6
Define chiral catalyst? What is Jacobsen-Katsuki epoxidation?
05
Explain ring fusion of cis and trans 9-methyl decalin? Comment on its chirality and point groups?
05
Explain physical effect of transannular ring closure in larger membered cyclic amino ketones?
04
Q.7
Write notes on any three:-
14
Enatiotopic and diastereotopic atoms, groups and faces
Optical purity and enantiomeric excess
Distereoselectivity in Aldol reactions
Stereochemistry of biphenyl compounds
Organic Chemistry
STEREO CHEMISTRY
Time: 2½ Hours
Max. Marks: 70
Instructions: Attempt in all five questions. Section I (question is compulsory. Attempt any two questions from Section II and any two questions from Section III. Answer to all five questions (from Section II, III) should be written in the one and same answer book. All questions carry equal marks. Figures to the right indicate full marks.
SECTION-I
Q.1.
Answer the following:
05
What is Re face and Si face?
What is ring flipping in cyclohexane?
Define chiral pool synthesis?
Define fused bicyclic compounds?
Define functional isomers?
B)Predict the product with stereochemistry.
SECTION II
Q.2
Discuss relative reactivity of distereomers in molecular elimination reactions?
07
Explain pyrolysis of cycloalkyldimethylamine oxides cycloalkyltrimethyl ammonium hydroxide in six membered and larger than six membered ring in details?
07
Q.3
What is distereoselectvity? What is distereoselective addition to carbonyl group? Explain via Felkin Ahn model.
07
Explain different isomers of perhydrophenanthrene and comment on its stability and chirality?
07
Q.4
Explain stability of cis and trans decalin and comment on their various physical properties?
07
What is enantioselective synthesis? Explain enantioselective synthesis via hydrazones?
07
SECTION III
Q.5
Define stereospecific reaction? Why Electrophilic epoxidation of alkenes are diastereospecific?
05
What is chiral reagent? What is synthesis of CBS reagent and its applications in enantioselective synthesis?
05
What is difference in the distereomers stability of Stilbene dichloride and Tartaric acid?
04
Q.6
Define chiral catalyst? What is Jacobsen-Katsuki epoxidation?
05
Explain ring fusion of cis and trans 9-methyl decalin? Comment on its chirality and point groups?
05
Explain physical effect of transannular ring closure in larger membered cyclic amino ketones?
04
Q.7
Write notes on any three:-
14
Enatiotopic and diastereotopic atoms, groups and faces
Optical purity and enantiomeric excess
Distereoselectivity in Aldol reactions
Stereochemistry of biphenyl compounds
Other Question Papers
Subjects
- advanced organic chemistry – i
- advanced organic chemistry – ii
- advanced spectroscopic methods
- analytical chemistry – i
- applied organic chemistry
- chemistry of natural products
- inorganic chemistry – i
- inorganic chemistry – ii
- instrumental methods of analysis (oet)
- organic chemistry – i
- organic chemistry – ii
- photochemistry and pericyclic reactions
- physical chemistry – i
- physical chemistry – ii
- stereochemistry