C.U.SHAH UNIVERSITY Winter Examination-2015 Subject Name: Stereochemistry in Organic Synthesis Subject Code: 4LS02CHM1
Branch: B.Sc. (Microbiology)
Semester: II Date: 20/11/2015 Time : 10.30 To 1.30 Marks : 70 Instructions: (1) Use of Programmable calculator & any other electronic instrument is prohibited. (2) Instructions written on main answer book are strictly to be obeyed. (3) Draw neat diagrams and figures (if necessary) at right places. (4) Assume suitable data if needed. Q-1
Attempt the following questions: What is stereospecific reaction? Define enantiomers Define solvent Define activation energy Define rate of reaction State Saytzeff rule What is stereoselective reaction? Draw energy diagram for two step reaction State Hoffman rule Write the characteristic features of inductive effect. What will be the structure and bong angle of molecules formed by sp hybridization? l) Define SN1 reaction m) Define hybridization n) Define E1(CB) reaction a) b) c) d) e) f) g) h) i) j) k)
Attempt any four questions from Q-2 to Q-8 Q-2 Attempt all questions a) Write differences between tautomerization and resonance with suitable example b) What are the differences between E1 and E2 reaction mechanism?
Page 1 || 2
(14) 1 1 1 1 1 1 1 1 1 1 1 1 1 1
(14) 7 7
Q-3
Q-4
Q-5
Q-6
Attempt all questions a) What is Friedel Crafts Alkylation reaction? Write different steps involved in the reaction mechanism. b) Write a note on effect of substituent’s on acidic strength of carboxylic acid.
(14) 7
Attempt all questions a) Discuss the basic criteria for aromaticity and antiaromaticity by suitable example. b) Write a note on displacement of electron through hyperconjugation with suitable example.
(14) 7
Attempt all questions a) Explain R,S and thereo-erythro nomenclature for stereoisomers with suitable examples. b) What are the different steps involved in drawing Fischer projection of organic compounds.
(14) 7
Attempt all questions a) Write a note on chirality in a molecule with no stereogenic centre b) What is hybridization? Explain the structure of ethylene based upon the concept of hybridization.
(14) 7 7
7
7
7
(14) Q-7
Q-8
Attempt all questions a) Write a note on stability of carbocation based upon inductive effect and resonance. b) Explain internal nucleophilic substitution and unimolecular elimination (conjugated base) reaction mechanism with suitable example. Attempt all questions a) Explain the stability of free radicals based upon resonance and hyperconjugation. b) Write a note on displacement of electron through inductive effect with suitable example.
b) Define enantiomers 1 ... a) Discuss the basic criteria for aromaticity and antiaromaticity by suitable ... Displaying Stereochemistry in Organic Synthesis.pdf.
File: Eliel stereochemistry pdf free. download. Download now. Click here if your download doesn't start automatically. Page 1 of 1. eliel stereochemistry pdf free download. eliel stereochemistry pdf free download. Open. Extract. Open with. Sign In. M
Nov 11, 2011 - grown for 24 h before being collected on silicon wafers by surface tension ..... large macroscopic strain defects seen under the sulfateÃDODAB.
Neiland and co-workers in 1957.19 Since then, numerous stable .... aryliodonium ylides is similar to the geometry of iodonium salts with a CâIâC angle close to ...
one of the main drivers in the drug discovery process. However .... sides within the central nervous system .... chemistry and made this technology a key driver.
Effect of phosphorus application with phosphate solubilizing ... mha in the world. Fifty per cent of total ... Application of plant growth regulators to boost yield of ...
Lee, Y. R.; Yoon, S. H.; Seo, Y.; Kim, B. S. Synthesis 2004, 2787-2798. http://dx.doi.org/10.1055/s-2004-831257. 79. Lee, Y. R.; Yoon, S. H. Synth. Commun.
laboratory/field work, computer programing to facilitate data management and analysis ... scientific presentations and analytical and programming skills), and the.
ACS Symposium Series 568:291. 33. ...... Their chemical inertness, their low toxicity and easy recovery after the reaction ...... Although the toxicity data generat-.
