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
B.
II > III > I
The ease of nitration of the hydrocarbons depends upon the stability of arenium ion formed.
In compound II, the carbonium ion has two methyl groups (with +I effect) capable of partially neutralising the positive charges on the ring carbon atoms. In compound I and II, only one methyl group can act in this way. Moreover, in compound III two methyl groups have +I effet, whereas in compound I only one methyl group with +I effect is present. Thus, the stability of arelium ion and ease of nitration follows the order,
II > III > I
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