JEE Questions for Chemistry Hydrocarbons Quiz 5 - MCQExams.com

Ethyl benzene cannot be prepared by
  • Wurtz reaction
  • Wurtz-Fittig reaction
  • Friedel-Craft's reaction
  • Clemmensen reduction
By passing excess Cl2 (g) in boiling toluene, which one of the following compounds is exclusively formed

  • Chemistry-Hydrocarbons-4684.png
  • 2)
    Chemistry-Hydrocarbons-4685.png

  • Chemistry-Hydrocarbons-4686.png

  • Chemistry-Hydrocarbons-4687.png
Friedel-Craft' s reaction using MeCl and anhydrous AlCl3 will take place most efficiently with
  • benzene
  • nitrobenzene
  • acetophenone
  • toluene
o-toluic acid on reaction with Br2 + Fe gives

  • Chemistry-Hydrocarbons-4690.png
  • 2)
    Chemistry-Hydrocarbons-4691.png

  • Chemistry-Hydrocarbons-4692.png

  • Chemistry-Hydrocarbons-4693.png
Which one of these is not true for benzene?
  • It forms only one type of monosubstituted product
  • There are three carbon-carbon single bonds and three carbon-carbon double bonds
  • The heat of hydrogenation of benzene is less than the theoretical value
  • The bond angle between the carbon-carbon bonds is 120°
Benzene on treatment with a mixture of conc. HNO3 and conc. H2 SO4 at 100°C gives
  • nitrobenzene
  • m-dinitrobenzene
  • p-dinitrobenzene
  • o-dinitrobenzene

Chemistry-Hydrocarbons-4697.png
  • C6H5OH
  • C6H6
  • C6H5COONa
  • C6H5ONa
The carbon-carbon bond length in benzene is
  • in between C2H6 and C2H4
  • same as in C2H4
  • in between C2H6 and C2 H2
  • in between C2H4 and C2H2
The carbon-carbon bond distance in benzene is
  • longer than a C—C single bond
  • longer than a C=C double bond
  • shorter than a C=C double bond
  • shorter than a C=C triple bond
An aromatic compound X with molecular formula C8H10 produces on nitration one mononitro derivative and three dinitro derivatives.Compound X would be
  • ethyl benzene
  • m-xylene
  • o-xylene
  • p-xylene
Distillation of acetone with concentrated sulphuric acid gives
  • diacetone alcohol
  • mesityl oxide
  • mesitylene
  • propene-2-ol
Toluene on treatment with CrO3 and (CH3CO)2O followed by hydrolysis with dil. HCl gives
  • benzaldehyde
  • benzoic acid
  • phenol
  • phenylacetaldehyde
Which one of the following compounds is prepared in the laboratory from benzene by a substitution reaction ?
  • Glyoxal
  • Cyclohexane
  • Acetophenone
  • Hexabromocyclohexane
Presence of a nitro group in a benzene ring
  • activates the ring towards electrophilic substitution
  • renders the ring basic
  • deactivates the ring towards nucleophilic substitution
  • deactivates the ring towards electrophilic substitution
The compound formed as a result of oxidation of ethyl benzene by KMnO4 is
  • benzophenone
  • acetophenone
  • benzoic acid
  • benzyl alcohol

Chemistry-Hydrocarbons-4704.png
  • 3-bromo -2, 4, 5, 6- trichlorotoluene
  • o-bromotoluene
  • p-bromotoluene
  • m-bromotoluene
Using anhydrous AlCl3 as catalyst, which one of the following reactions produce ethylbenzene (PhEt) ?
  • H3C — CH2 OH + C6 H6
  • CH3—CH = CH2 + C6 H6
  • H2C = CH2 + C6 H6
  • H3C —CH3 + C6 H6
Benzene reacts with chlorine in sunlight to give a final product
  • CCl4
  • C6H6Cl6
  • C6Cl6
  • C6H5Cl

Chemistry-Hydrocarbons-4708.png
  • benzoic acid
  • 4-nitrobenzene
  • 4-nitrobenzoic acid
  • 2-nitrobenzoic acid
Friedel-Craft acylation can be given by X is
Chemistry-Hydrocarbons-4710.png

  • Chemistry-Hydrocarbons-4711.png
  • 2)
    Chemistry-Hydrocarbons-4712.png

  • Chemistry-Hydrocarbons-4713.png

  • Chemistry-Hydrocarbons-4714.png
Identify the substitute group, that acts as ortho-para director, during electrophilic substitution in aromatic compounds.
  • —NH2
  • —NO2
  • —SO3H
  • N2
According to Huckel's rule an aromatic compound must possess
  • (4n +π-electrons
  • (4n +π-electrons
  • 4n π- electrons
  • (4n +π-electrons
Phenyl magnesium bromide reacts with methanol to give
  • a mixture of anisol and Mg(OH)Br
  • a mixture of benzene and Mg(OMe)Br
  • a mixture of toluene and Mg(OH)Br
  • a mixture of phenol and Mg(Me)Br
What is obtained when chlorine is passed in boiling toluene and product is hydrolysed ?
  • p-cresol
  • o-cresol
  • 2,4-dihydroxytoluene
  • benzyl alcohol
Aromatisation of n-heptane by passing over (Al2O3 + Cr2O3 ) catalyst at 773 K gives
  • benzene
  • toluene
  • mixture of both
  • heptylene

Chemistry-Hydrocarbons-4719.png
  • benzaldehyde
  • toluic acid
  • phenyl acetic acid
  • benzoic acid
Benzene can be obtained by heating either benzoic acid with X or phenol with Y. X and Y are respectively
  • zinc dust and soda lime
  • soda lime and zinc dust
  • zinc dust and sodium hydroxide
  • soda lime and copper
Which of the following reacts with benzene in presence of anhydrous aluminium chloride and forms acetophenone ?
  • CH3Cl
  • CH3COOH
  • CH3CHO
  • CH3COCl
A cyclic hydrocarbon molecule has all the carbon and hydrogen in a single plane. All the carbon-carbon bonds are of same length, less than 1.54 Å , but more than 1.34 Å . The C—C bond angle will be
  • 109°28'
  • 100°
  • 180°
  • 120°
Aqueous H2SO4 reacts with 2-methyl-but-1-ene to give predominantly
  • 2-methyl-butane -1-ol
  • 2-methyl-butane -2–ol
  • Isobutyl Hydrogen sylphate
  • Sec. butyl hydrogen sulphate
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