Organic reaction mechanisms

Organic reaction mechanisms: involving addition, elimination and substitution reactions with electrophilic, nucleophilic or radical species. Determination of reaction pathways.

YEAR JUN-2016 DEC-2015 JUN-2015 DEC-2014 JUN-2014 DEC-2013 JUN-2013 DEC-2012 JUN-2012 DEC-2011 JUN-2011
No.of questions appeared 1 3 3 1 3 1 3 2 1 1 1

1.The intermediate A and the major product B in the following reaction sequence are

mechanisam-csir-ner-gate-chemical-science-june-2016

 

 2.The mechanism and the product formed in the following reaction, respectively, are

mechanisam-csir-ner-gate-chemical-science-dec-2015

 

 

 3.The major product formed in the following reaction is…..

selonoxide-elimination-mechanisam-csir-ner-gate-chemical-science-dec-2015

 

4.The major products A and B in the following reactions are

pyrolytic-syn-elimination-mechanisam-csir-ner-gate-chemical-science-dec-2015

 

 

5.The correct combination of the following reactions and their ρvalues is

 

Entry Reaction Entry value
A ArNH2+ PhCOCl

in benzene

P 2.01
B ArO+EtI in EtOH Q – 0.99
C ArCO2+ aq NaOH in EtOH R – 2.69
    S + 0.78

 (a) A-P; B-R; C-P

(b) A-R; B-Q; C-P

(c) A-R; B-P; C-Q

(d) A-Q; B-R; C-S

 

6.The major product formed in the following reaction is

mechanisam-csir-ner-gate-chemical-science-june-2014

 

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