Haloalkanes and Haloarenes

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

• CH₃ – C ≡ CH + 2HBr →

• CH₃CH = CHBr + HBr →

• CH ≡ CH + 2HBr →

• CH ≡ CH + 2HBr →

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

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

• 4-phenylcyclopentene

• 2-phenylcyclopentene

• 1-phenylcyclopentene

• 1-phenylcyclopentene

The structure of the major product formed in the following reaction

Which of the following is the correct order of decreasing S_N2 reactivity? 

• RCH₂X > R₃CX > R₂CHX

• RCH₂X > R₂CHX > R₃CX

• R₃CX > R₂CHX >RCH₂X

• R₃CX > R₂CHX >RCH₂X

The organic chloro compound, which shows complete stereochemical inversion during a S_N2 reaction,is

• (C₂H₅)₂CHCl 

•  (CH₃)₃CCl

• (CH₃)₂CHCl

• (CH₃)₂CHCl

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

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

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

The treatment of CH₃MgX with CH₃C≡C−H produces

• CH₃−CH=CH₂ 

• CH₃C≡C−CH₃

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