Organic reactive intermediates

Organic reactive intermediates: Generation, stability and reactivity of carbocations, carbanions, free radicals, carbenes, benzynes and nitrenes.

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 3 3 4 1 2   – 1 2 2 1 2

1.The frontier orbital interactions involved in the formation of the carbocation intermediate in the reaction of isobutylene with HCl are

(1) π of olefin and σ* of HCl

(2) π of olefin and σ of HCl

(3) π*of olefin and σ* of HCl

(4) π*of olefin and σ of HCl

 

2.The correct statements are about the reaction of X and Y with NaNH2 are

1-carbanion-csir-net-gate-chemical-science-june-2016

1.X reacts faster than Y

2.Y reacts faster than X

3.X and Y behave as Lewis acids

4.X is stronger Bronsted acid than Y

(1) A and C

(2) A and D

(3) B and C

(4) B and D

 

3.The major product formed in the following reaction is

enolate-intermediate-csir-net-gate-chemical-science-june-2016

 

4.The major product formed in the following reaction is

3-cyclo-propane-csir-net-gate-chemical-science-june-2016

 

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

4-carbene-csir-net-gate-chemical-science-dec-2015

 

6.The correct statement about the following reaction is that

carbene-csir-net-gate-chemical-science-dec-2015

carbene-csir-net-gate-chemical-science-dec-2015

 

7.The major products A and B in the following reaction sequence are

6-epoxide-csir-net-gate-chemical-science-dec-2015

 

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