Question:
Which of the following can give a Grignard reagent when reacted with magnesium m dry ether?
Which of the following can give a Grignard reagent when reacted with magnesium m dry ether?
Updated On: Aug 17, 2024
- $ {{C}_{2}}{{H}_{6}} $
- $ {{C}_{2}}{{H}_{5}}Cl $
- $ {{C}_{2}}{{H}_{5}}OH $
- $ {{C}_{2}}{{H}_{5}}CN $
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The Correct Option is B
Solution and Explanation
$ {{\text{C}}_{\text{2}}}{{\text{H}}_{\text{5}}}\text{Cl} $ can give Grignard reagent when reacted with Mg in dry ether. $ RX+Mg(dry)\xrightarrow{\text{Dry}\,\text{ether}}RMgX $ $ {{C}_{2}}{{H}_{5}}Cl+Mg\underset{\,\,\,\,\,\,\,\,\,\,\,\,\,\text{Ethyl}\,\text{magneslum}\,\text{chloride}}{\mathop{\xrightarrow{\text{Dry}\,\text{ether}}{{C}_{2}}{{H}_{5}}MgCl}}\, $
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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