C.U.SHAH UNIVERSITY WADHWAN CITY University (Winter) Examination -2013 Course Name : MSc(Chemistry) Semester-I Subject Name: Organic Chemistry Duration :- 2:30 Hours
Date : 04/12/2013
Instructions:(1) Attempt all Questions of both sections in same answer book / Supplementary. (2) Use of Programmable calculator & any other electronic instrument is prohibited. (3) Instructions written on main answer Book are strictly to be obeyed. (4)Draw neat diagrams & figures (If necessary) at right places. (5) Assume suitable & Perfect data if needed.
SECTION – I Q-1 All questions are Compulsory 1. Define term: Curved arrow 2. Distinguish between: Homolytic and heterolytic bond fission 3. Classify the following as nucleophiles and electrophiles NH3, OH-, AlCl3, Br4. Differentiate Clemmensen and wolf-kishner reduction
(1) (2) (2) (2)
Q-2 Discuss the following questions (5) 1. Give the mechanism of following reaction: a) Nazarov cyclization b) Noyori reaction 2. What is arrow notation? Explain different types of arrows used in the organic chemistry. (5) 3. Justify the following statements: (4) a) Elbs persulphate oxidation always takes place in the p-position. b) Rosenmund reaction stops at the aldehyde stage. OR Q-2 Discuss the following questions 1. Give the mechanism of following reaction: (5) a) Oppenauer oxidation b) Birch reduction 2. What is linear free energy relationship? Derive and explain the Hammett equation.(5) 3. Justify the following statements: (4) a) Knoevenagel reaction is more useful with aliphatic aldehyde than with aromatic. b) Electron donating groups yield o-substituted product in the birch reaction. Q-3 Discuss the following questions (7) 1. Write notes on a) Michael addition b) Perkin reaction 2. Answer the following question: (7) a) Explain darzen reaction with proper mechanism. Give important application of darzen reaction. 1/2
4
b) What is aldol condensation? Give its proper mechanism. Write the products of crossed aldol condensation involving equimolar amounts of acetaldehyde and formaldehyde. OR Q-3 Discuss the following questions (7) a) Write notes on b) Reformatsky c) Witting reaction 1. Answer the following question (7) a) What is prins reaction? Explain its different products depending on the reaction conditions. Give its application also. b) Explain Horner-Wordwoth-Emmons reaction. SECTION – II Q-4 Compulsory and short type question (1 or 2 marks) 1. Define term: Rearrangement (1) 2. What is Dess-Martin reagent? How it is prepared and what is its specific use. (2) 3. How Trimethylsilyl iodide is prepared and give its application. (2) 4. Write down preparation and application of Ceric ammonium nitrate. (2) Q-5 Discuss the following questions (5) 1. Explain the following: a) Favourskii rearrangement b) Schmidt rearrangement 2. Explain the following: (5) a) Curtius rearrangement b) Discuss the migratory aptitude of pinacol-pinacolone rearrangement. 3. Write notes on following reagents (4) a) Sodium cyanoborohydride b) Phase transfer catalyst OR Q-5 Discuss the following questions 1. Explain the following: (5) a) Baeyer-villiger rearrangement b) Demyanov rearrangement 2. Explain the following: (5) a) Beckmann rearrangement b) Explain the types of rearrangement and discuss general mechanism behind the nature of migration in rearrangement. 3. Write notes on following reagents (4) a) Merrifield resin b) Wilkinson catalyst Q-6 Discuss the following questions 1. Explain the Wagner-Meerwein rearrangement with its proper mechanism. (7) 2. Neber rearrangement (7) OR Q-6 Discuss the following questions (14 Marks- Each Question Indicate 7 Marks) 1. What is pinacol-pinacolone rearrangement? Give mechanism and its application in detail 2. Benzillic acid rearrangement *******4*******
Explain the Wagner-Meerwein rearrangement with its proper mechanism. (7). 2. Neber rearrangement (7). OR. Q-6 Discuss the following questions (14 Marks- ...
A Write a note on Frontier orbital theory 05. B Discuss the Woodward-Hoffmann rule for cyclo addition reaction 05. C Write a note on Perturbation molecular ...
A new series of highly efficient Ir(III) complexes, (DPQ), Ir(pic-N-O), (FPPQ)lr(pic-N-O),. (FPQ), Ir(pic-N-O), and (CPQ), Ir(pic-N-O) were synthesized for phosphorescent organic light-emitting diodes (PhOLEDs), and their photophysical, electrochemic
LaTOP Organic Stall # 32, Public Market, La Trinidad, Benguet,. Baguio City vegetable ... Kalinga State College (KSC); Ifugao State University (IFSU and other.
Retrying... Download. Connect more apps... Try one of the apps below to open or edit this item. Organic Food.pdf. Organic Food.pdf. Open. Extract. Open with.
"Soon will the present-day order be rolled up, and a new one spread out in its stead. Verily ...... All the Baha'is are so very busy doing the day-to-day work of building the ... Shoghi Effendi, Baha'i Youth: A Compilation, comp. by NSA of the U.S.,
1. /. 6. Loading⦠Page 1 of 6. Page 1 of 6. Page 2 of 6. Page 2 of 6. Page 3 of 6. Page 3 of 6. Main menu. Displaying Organic Production System.pdf. Page 1 of 6.
There was a problem previewing this document. Retrying... Download. Connect more apps... Try one of the apps below to open or edit this item. Organic ...
The Natural Medicines Comprehensive Database (NMCD) states that echinacea is Possibly Effective only. for the common cold. All other uses require more ...
h) Give the mechanism of Baeyer – Villiger oxidation with an example. i) Predict the product and propose a mechanism. j) What is Lossen rearrangement ?
quantum efficiencies in the visible spectrum,2.3 including the .... from the EL diode is linearly propor- tional to the input current in the current range from 10 - I to.
There was a problem previewing this document. Retrying... Download. Connect more apps... Try one of the apps below to open or edit this item. Organic Chem ...Missing:
Loading⦠Page 1. Whoops! There was a problem loading more pages. Retrying... Organic Chemistry Lab.pdf. Organic Chemistry Lab.pdf. Open. Extract. Open with. Sign In. Main menu. Displaying Organic Chemistry Lab.pdf.
Data-to-parameter ratio = 23.6 .... Data collection: COLLECT (Nonius, 1998); cell refinement: EvalCCD (Duisenberg et al., 2003); data reduction: EvalCCD;.
Mar 26, 2002 - most of the farmers who committed suicide in. Maharashtra in 1998 were Dalits. Extension services have totally failed this community, which has only recently taken to farming .... cloud if thrown in the air (ISCI 1999; p. 6). However,
Some researchers think echinacea can strengthen immune function because of certain bacteria that live. on the plants. [4]. NMCD states that echinacea may ...
i) Distinguish between antarafacial and suprafacial hydrogen shifts in sigmatropic. rearrangements. j) Complete the following : k) Outline the mechanism for the ...
"People dream to get lasers that can ignite by simple connection of the film to the power source, but they haven't achieved success yet,"- told Paraschuk.
