Question:
Ethyl bromide is industrially prepared from
Ethyl bromide is industrially prepared from
Updated On: Jul 28, 2022
- ethyl alcohol $+ HBr$
- ethanol $+ Br_2$
- alcohol $+ HBr$
- none of these
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The Correct Option is A
Solution and Explanation
Industrial preparation o f ethyl bromide - By refluxing the alcohol with constant boiling HBr $(48 \%)$ in presence o f little concentrated sulphuric acid
$C_{2}H_{5}OH+HBr$ $ { ->[{H_{2}SO_{4} {\text(conc.)}}][{\text{reflux}}] } C_{2}H_{5}Br+H_{2}O$
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Concepts Used:
Preparation of Haloalkanes
- Preparation by Alcohols: By using alcohol, we can very easily prepare Haloalkane as when R-OH is reacted with a suitable reagent it will form R-X. The following reagents will help in the formation of the reactions:
- Halogen Acids (HX)
- Thionyl chloride (SOCl2)
- Phosphorous halides (PX5 or PX3)
- Preparation by Free Radical Halogenation: The formation of alkyl bromides and alkyl chloride is very much possible with the help of free radical halogenation, but as these radicals are highly reactive and non-specific in nature, they can result in the formation of a mixture of products. Though, it's not a preferred method for the preparation of haloalkanes. For example, free radical chlorination can result in the formation of a number of haloalkanes, which in turn makes it difficult to set apart a single product.
- Preparation by Alkenes: An electrophilic addition reaction can be used to transform an alkene into a haloalkane as alkene will react with HX to form R-X.
Read More: Haloalkanes and Haloarenes