Name: Introduction to Haloalkanes
Uploaded: 2019-07-19
Duration: 7 min 7 s
Description: The haloalkanes (alkyl halides) are a group of chemical compounds derived from alkanes containing one or more halogens. Watch this video to learn more about...

Question

What are the main products formed, when ethyl bromide reacts with

KCN, AgCN, KI

in acetone,

{AgNO}_{2}, {KNO}_{2}, aq . KOH

and alcoholic

KOH

? Give equations.

Accepted Answer

Reaction of ethyl bromide with $KCN$ :

Ethyl bromide when treated with aqueous or alcoholic $KCN$ , ethyl cyanide is formed. This involves the nucleophilic attack of ${CN}^{-}$ on ethyl bromide.

${CH}_{3} {CH}_{2} Br + KCN \to {CH}_{3} {CH}_{2} CN + KBr$

Reaction of ethyl bromide with $AgCN$ :

Ethyl bromide when treated with aqueous silver cyanide, forms ethyl isocyanide.

This is a substitution reaction by isocyanide group.

${CH}_{3} {CH}_{2} Br + AgCN \to {CH}_{3} {CH}_{2} - NC + AgBr$

Reaction of ethyl bromide with $KI$ in acetone:

When ethyl bromide is reacted with $KI$ in acetone, ethyl iodide is formed as a result of halogen exchange and the reaction is known as Finkelstein reaction.

$C_{2} H_{5} Br + KI \overset{Acetone}{\to} C_{2} H_{5} I + KBr$

Reaction of ethyl bromide with ${AgNO}_{2}$ :

Ethyl bromide when treated with alcoholic solution of silver nitrate, nitroethane is formed as a major product. This is a substitution reaction by nitro group.

${CH}_{3} {CH}_{2} Br + {AgNO}_{2} \to {CH}_{3} {CH}_{2} {NO}_{2} + AgBr$

Reaction of ethyl bromide with $aq . KOH$ :

When ethyl bromide is reacted with aqueous potassium hydroxide (caustic potash), alcohol is formed. The reaction is called a hydrolysis reaction.

${CH}_{3} {CH}_{2} Br + KOH (aq) \to {CH}_{3} {CH}_{2} OH + KBr$

Reaction of ethyl bromide with alcoholic $KOH$ :

When ethyl bromide is reacted with alcoholic potash, ethene is obtained. This reaction is called as dehydrohalogenation (removal of hydrogen and halogen) which is an elimination reaction. This is a process of preparing alkenes from haloalkanes.

The reaction is:

$C_{2} H_{5} Br + alc . KOH \to {CH}_{2} = {CH}_{2} + KBr + H_{2} O$

What are the main products formed, when ethyl bromide reacts with $KCN, AgCN, KI$ in acetone, ${AgNO}_{2}, {KNO}_{2}, aq . KOH$ and alcoholic $KOH$ ? Give equations.

Important Questions on Haloalkanes (Alkyl Halides)

Learn and Prepare for any exam you want !

What are the main products formed, when ethyl bromide reacts with KCN, AgCN, KI in acetone, AgNO2,KNO2, aq.KOH and alcoholic KOH? Give equations.

Important Questions on Haloalkanes (Alkyl Halides)

Learn and Prepare for any exam you want !

What are the main products formed, when ethyl bromide reacts with $KCN, AgCN, KI$ in acetone, ${AgNO}_{2}, {KNO}_{2}, aq . KOH$ and alcoholic $KOH$ ? Give equations.