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 -$\mathrm{\sigma }$-bond

• C₂-C₃ bond is sp³-sp² -$\mathrm{\sigma }$-bond

• C₁-C₂ bond is an sp³-sp² -$\mathrm{\sigma }$-bond

• C₁-C₂ bond is an sp²-sp² -$\mathrm{\sigma }$-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 4th higher homologue of ethane is

• butane

• pentane

• hexane

• heptane

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

99.

The most likely protonation site in the following molecule is

• C-1

• C-2

• C-3

• C-6

The structure of isobutyl group in an organic compound is

• C₂H₆$-$CH$-$CH₂$-$

• ${\mathrm{CH}}_3-\underset{|}{\mathrm{CH}}-{\mathrm{CH}}_2-{\mathrm{CH}}_3$

• ${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{CH}}_2-$

• ${\mathrm{CH}}_3-\mathrm{C}\left({\mathrm{C}}_2{\mathrm{H}}_6\right)-$