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 Multiple Choice QuestionsMultiple Choice Questions

1.

Which one of the following has the minimum boiling point?

  • n-butane

  • isobutane

  • 1- butene

  • 1- butene


B.

isobutane

Isobutene (H3C)2 - C=CH2 has the minimum force of attraction (due to steric hindrance).Thus minimum boiling point.

223 Views

2.

The compound formed on heating chlorobenzene with chloral in the presence concentrated sulphuric acid is

  • gammexene

  • hexachloroethane

  • Freon

  • Freon


D.

Freon

CCl subscript 3 CHO space plus space 2 straight C subscript 6 straight H subscript 5 Cl space rightwards arrow with Conc. space straight H subscript 2 SO subscript 4 on top space DDT
416 Views

3.

Elimination of bromine from 2-bromobutane results in the formation of-

  • equimolar mixture of 1 and 2-butene

  • predominantly 2-butene

  • predominantly 1-butene

  • predominantly 1-butene


B.

predominantly 2-butene

Saytzeffs product

309 Views

4.

Tertiary alkyl halides are practically inert to substitution by SN2 mechanism because of

  • insolubility

  • instability

  • inductive effect

  • inductive effect


D.

inductive effect

516 Views

5.

Alkyl halides react with dialkyl copper reagents to give

  • alkenes

  • alkyl copper halides

  • alkanes

  • alkanes


C.

alkanes

R2CuLi + R'X → R-R' +R-Cu +LiX

353 Views

6.

Rate of the reaction



is fastest when Z is

  • Cl

  • OCOCH3

  • OC2H5

  • OC2H5


A.

Cl

Cl- is the best leaving group being the weakest nucleophile out of NH2-, Cl-, -OC2H5 and -OOCCH3.

202 Views

7.

The IUPAC name of the compound shown below is

  • 2-bromo-6-chlorocyclohex-1-ene

  • 6-bromo-2-chlorocyclohexene

  • 3-bromo-1-chlorocyclohexene

  • 3-bromo-1-chlorocyclohexene


C.

3-bromo-1-chlorocyclohexene

185 Views

8.

Which of the following will have meso-isomer also?

  • 2- chlorobutane

  • 2- hydroxyopanoic acid

  • 2,3 – dichloropentane

  • 2,3 – dichloropentane


D.

2,3 – dichloropentane

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9.

2 methylbutane on reacting with bromine in the presence of sunlight gives mainly

  • 1 – bromo -2 - methylbutane

  • 2 – bromo -2 - methylbutane

  • 2 – bromo -3 - methylbutane

  • 2 – bromo -3 - methylbutane


B.

2 – bromo -2 - methylbutane

244 Views

10.

HBr reacts with CH2 = CH – OCH3 under anhydrous conditions at room temperature to give 

  • CH3CHO and CH3Br

  • BrCH2CHO and CH3OH

  • BrCH2 – CH2 – OCH3

  • H3C – CHBr – OCH3


D.

H3C – CHBr – OCH3

Methyl vinyl ether is a very reactive gas. It is hydrolysed rapidly by dilute acids at room temperature to give methanol and aldehyde. However, under anhydrous conditions at room temperature, it undergoes many addition reactions at the double bond.

Electrophilic addition reaction more favourable.

HBr reacts with CH2 = CH – OCH3 under anhydrous conditions at ro