AN2C06/AP2C06/CH2C06/PH2C06/PO2C06 Organic Reaction Mechanism M.Sc Model Question Paper : mgu.ac.in

Name of the University : Mahatma Gandhi University
Department : Chemistry
Degree : M Sc Chemistry
Subject Code/Name : AN2C06/AP2C06/ CH2C06/ PH2C06/ PO2C06/Organic Reaction Mechanism
Sem : II
Website : mgu.ac.in
Document Type : Model Question Paper

Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/mgu.ac.in/5160-MScChem%20SemII-MQP.pdf

Organic Reaction Mechanism Question :

(common to all branches of Chemistry )
Model Question Paper
Time: 3 Hrs

Related : MGU Coordination Chemistry M.Sc Model Question Paper : www.pdfquestion.in/5159.html

Max. Weight: 30
Section A :
(Answer any 10 questions. Each question carries a weight of 1)
01. Explain regioselectivity in addition reactions, with special reference to Markovnikov’s addition. What are the mechanistic reasons for the selectivity?
02. Comment on the role of reagents and leaving groups in SN1 and SN2 reactions.

03. What are the important factors affecting the stability of carbanions? Discuss the structure of carbanions.
04. Give examples of sulphur and phosphorous ylides. Explain Peterson olefination.

05. Write the mechanism of Benzil-Benzilic acid rearrangement.
06. Write briefly on classical and non-classical carbocations.
07. How will you distinguish between singlet and triplet carbenes based on their stability and stereochemical bahaviour in addition reactions?

08. Amination of haloarenes show high preferences in orientation. Explain with examples.
09. Explain the structure and stability of carbon free radicals.
10. What is auto-oxidation? Illustrate with examples.

11. Explain the mechanism of Robinson annelations.
12. Give an example of an electrocyclic reaction. Explain the mechanism.
13. Write briefly on sigmatropic rearrangements. Illustrate with examples.
(10×1=10 weights)

Section B :
(Answer 5 questions by attempting not more than 3 questions from each bunch. Each question carries a weight of 2)
Bunch 1: (Problem Type)
16. Predict which enone product would be formed in this intramolecular aldol condensation.
Explain the mechanism of the reaction.

17. In Cannizzaro reaction, what are the evidences obtained in support of:
(a) ionic mechanism
(b) mechanism involving the formation of an intermediate dimeric adduct, and
(c) mechanism involving the formation of an ester intermediate.

Bunch 2 : (Short Essay Type)
18. What are cycloaddition reactions? Explain (4+2) cycloaddition by FMO method.
19. Explain the mechanisms of Aldol condensation and Michael reaction.
20. Distinguish between Saytzef and Hofmann elimination.

21. Comment on the chemistry of enolates and enamines. What is meant by kinetic and thermodynamic enolates?
(5×2=10 weights)

Section C :
(Answer any 2 questions. Each question carries a weight of 5)
22. Explain the mechanism of nucleophilic addition to carbonyl compounds. Write notes on:
(a) Favorski rearrangements
(b) Shapiro reaction
(c) Julia elimination, and
(d) Darzen and acyloin condensations.

23. Give a detailed account of the C-C bond forming reactions involving carbocations.
24. Write briefly on the molecular rearrangements involving nitrene intermediates, with special reference to Hofmann, Curtius, Lossen and Beckmann rearrangenets. Discuss the stereochemical preferences in Beckmann rearrangement.

25. Discuss and illustrate the applications of pericyclic reactions in organic synthesis taking examples such as Claisen, Cope, Mislow-Evans and Wittig reactions. (2×5=10 weights)

Model Question Paper :
V Semester :
B. Sc. Physics -Instrumentation (Model III)
PH5B61U- Microprocessors
Instructions :
1. Time allotted for the examination is 3 Hours.
2. Answer all questions in Part A. This contains 4 bunches of 4 objective type questions. For each bunch, Grade A will be awarded if all the 4 questions are correct, B for 3, C for 2, D for 1 and E for 0. Answer any 5 questions from Part B, any 4 from Part C and any 2 from Part D.
3. Candidates can use ……………………….(type of calculator/tables)

Part A : ( Objective type- weight 1 each)
Bunch I
Choose the correct answer from the bracket given below
1.—–is a logic circuit which amplifies the current or power. (buffer ,counter)
2.—– is a non maskable interrupt. (TRAP,INTR)

3.—– instruction is used to copy data from the accumalator into the memory location specified by the 16 bit operand. (LDA 16 bit,STA 16 bit)
4. 8085 is a — bit processor. (8,16)

Bunch II :
Select the suitable word for the following statements, given in bracket. (address bus,zero,eight,16,8)
5. ———— is a group of lines that are used to send a memory address from the MPU to the memory location or the periferal.

6. In memory mapped I/O, the MPU uses—- address lines to identify an I/O device.
7. —- flag is set if the ALU operation result is zero.
8.The flag register is —- bit wide ,for an 8085 processor.