Question:
Which among the following reactions does NOT form alkyl halides?
Which among the following reactions does NOT form alkyl halides?
Updated On: Aug 21, 2024
Alcohol reacts with HCl in presence of anhydrous ZnCl2
- Alcohol reacts with halogen in presence of sunlight
Alcohol reacts with HI in presence of NaI/H3PO4.
Alcohol reacts with HBr in presence of NaBr,H2SO4
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The Correct Option is B
Solution and Explanation
The reaction that does not form alkyl halides is option (B) where alcohol reacts with a halogen in the presence of sunlight.
In this reaction, the alcohol undergoes a substitution reaction with the halogen (such as chlorine or bromine) to form an alkyl halide. However, this reaction does not require the presence of any catalyst or reagent. The sunlight is used to initiate the reaction by providing energy for the bond-breaking and bond-forming processes.
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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.
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