Brown ring in the test of NO3- is formed due to the formation of :
FeSO4 . NO
[Fe(SO4)2 . NO] H2O
Fe(SO4)3 . NO
none of these
Which kind of fission is favoured by sunlight ?
Heterolytic fission
Homolytic fission
Both (a) and (b)
None of the above
Which type of isomerism is shown by propanal and propanone ?
Functional group
Metamerism
Tautomerism
Chain isomerism
The correct order of ease of dehydration of following is :
I > II > III
III > II > I
I > III > II
III > I > II
Among the following which one can have a meso form?
CH3CH(OH)CH(Cl)C2H5
CH3CH(OH)CH(OH)CH3
C2H5CH(OH)CH(OH)CH3
HOCH2CH(Cl)CH3
The major product obtained on the monobromination (with Br2/FeBr3) of the following compound A is
Among the following the strongest nucleophile is
C2H5SH
CH3COO-
CH3NH2
NCCH2-
A.
C2H5SH
Nucleophiles are those substances which can donate a pair of electrons. These can be neutral or negative. The nucleophilic power depends on the tendency of species to donate electrons. This is more, when an electron pushing group(+I group) is present. Among the alkyl groups, those have higher number of C-atoms will push more, hence ethyl > methyl.
Among the following the most stable compound is
cis-1,2-cyclohexanediol
trans-1,2-cyclohexanediol
cis-1,3-cyclohexanadiol
trans-1,3-cyclohexanediol.