Rate determining step in nitration of benzene is
formation of NO2+
formation of carbocation
replacement of H atom
none of these.
1,4-dimethylbenzene on heating with anhydrous AlCl3 and HCl produces
1, 2-dimethylbenzene
1, 3-dimethylbenzene
1, 2, 3-trimethylbenzene
ethylbenzene
In 2-butene, which one of the following statements is true?
C1-C2 bond is sp3-sp3 --bond
C2-C3 bond is sp3-sp2 --bond
C1-C2 bond is an sp3-sp2 --bond
C1-C2 bond is an sp2-sp2 --bond
The stability of Me2C=CH2 is more than that of MeCH2CH=CH2 due to:
inductive effect of the Me groups
resonance effect of the Me groups
hyperconjugation effect of the Me groups
resonance as well as the inductive effect of the Me groups
Friedel-Craft's reaction using MeCl and anhydrous AlCl3 will take place most efficiently with:
benzene
nitrobenzene
acetophenone
toluene
The ease of nitration of the following three hydrocarbons follows the order:
II = III = I
II > III > I
III > II > I
I = III > II
Among the alkenes which one produces tertiary butyl alcohol on acid hydration?
CH3-CH2-CH=CH2
CH3-CH=CH-CH3
(CH3)2C=CH2
CH3-CH=CH2
The most likely protonation site in the following molecule is
C-1
C-2
C-3
C-6
A.
C-1
Addition of a proton at C1 results in the formation of tropylium carbocation (i.e. an aromatic species with more stability due to delocalisation of electrons), thus, it is the most reactive site towards protonation.
Addition of proton. at any other carbon atom, interupt in the delocalisation of electrons by disturbing planarity of molecules and hence, makes it less stable. Thus, these all are less reactive towards protonation.