Question

CHEMISTRY JEE - REACTION MECHANISM

Answer 1

Answer:

Haloalkanes give alkene when heated with alcoholic potassium hydroxide , Dehydrohalogenation reaction. The formation of more substituted alkene will be favored. So, when we 2- bromobutane is heated with alcoholic KOH we will get major yield of But-2ene and minor yeild of But-1-ene

Answer 2

Some points about E-2 Reactions

• This reaction is purely simultaneous reaction.It implies removal of halogen and base group takes place simultaneously.Therefore,no carbocation involved.

• Since,no carbocations are involved .Rearrangement is not possible.

• The reaction is 1,2 reaction if the carbon at which halogen is attached is named C-1.

• The reagent used for E-2 elimination in dehydrohalogenation reactions are $NaNH_2 \: ,\: ,EtOK \:,\: Alcoholic\:KOH$

Reaction

Since ,at C-2 there is no hydrogen.Reaction is not possible.Therefore,zero product possible.

The answer is 0.