Which of the following is the correct order of decreasing SN2 re

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 Multiple Choice QuestionsMultiple Choice Questions

481.

Toluene is nitrated and the resulting product is reduced with tin and hydrochloric acid. The product so obtained is diazotised and then heated with cuprous bromide. The reaction mixture so formed contains

  • mixture of o− and p−bromotoluenes

  • mixture of o− and p−dibromobenzenes

  • mixture of o− and p−bromoanilines

  • mixture of o− and p−bromoanilines

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482.

The organic chloro compound, which shows complete stereochemical inversion during a SN2 reaction,is

  • (C2H5)2CHCl 

  •  (CH3)3CCl

  • (CH3)2CHCl

  • (CH3)2CHCl

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483.

The treatment of CH3MgX with CH3C≡C−H produces

  • CH3−CH=CH

  • CH3C≡C−CH3

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484.

Which of the following reactions will yield 2, 2-dibromopropane?

  • CH3 – C ≡ CH + 2HBr →

  • CH3CH = CHBr + HBr →

  • CH ≡ CH + 2HBr →

  • CH ≡ CH + 2HBr →

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485.

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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486.

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

  • RCH2X > R3CX > R2CHX

  • RCH2X > R2CHX > R3CX

  • R3CX > R2CHX >RCH2X

  • R3CX > R2CHX >RCH2X


B.

RCH2X > R2CHX > R3CX

More is the steric hindrance at the carbon bearing the halogen, lesser is the SN2 reactivity. 

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487.

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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488.

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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489.

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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490.

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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