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 Multiple Choice QuestionsMultiple Choice Questions

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21.

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 nucleophilic substitution

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22.

Which of the following is the correct order of decreasing SN2 reactivity? 

  • RCH2X > R3CX > R2CHX

  • RCH2X > R2CHX > R3CX

  • R3CX > R2CHX >RCH2X

  • R3CX > R2CHX >RCH2X

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23.

The IUPAC name of 

  • 1, 1-diethyl-2-dimethylpentane

  • 4, 4-dimethyl-5, 5-diethylpentane

  • 5, 5-diethyl-4, 4-dimethylpentane

  • 5, 5-diethyl-4, 4-dimethylpentane

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24.

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


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25.

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

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26.

Phenyl magnesium bromide reacts with methanol to give

  • a mixture of anisole and Mg(OH)Br

  • a mixture of benzene and Mg(OMe)Br

  • a mixture of toluene and Mg(OH)Br

  • a mixture of toluene and Mg(OH)Br

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27.

The structure of the major product formed in the following reaction

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28.

Reaction of trans-2-phenyl-1-bromocyclopentane on reaction with alcoholic KOH produces 

  • 4-phenylcyclopentene

  • 2-phenylcyclopentene

  • 1-phenylcyclopentene

  • 1-phenylcyclopentene

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29.

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

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30.

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

  • insolubility

  • instability

  • inductive effect

  • inductive effect

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