The Wurtz-Fittig reaction involves condensation of:
- two molecules of aryl halides
- one molecule of each of aryl-halide and alkyl-halide
- one molecule of each of aryl-halide and phenol
- two molecules of aralkyl-halides
The Correct Option is B
Solution and Explanation
The Wurtz-Fittig reaction is a coupling reaction that involves the condensation of different types of halides. Let's go through the options and determine which one correctly describes this reaction:
- Two molecules of aryl halides: The Wurtz reaction typically involves coupling two alkyl halides, not aryl halides. Therefore, this option is incorrect for the Wurtz-Fittig reaction, which specifically includes both an aryl and an alkyl component.
- One molecule of each of aryl-halide and alkyl-halide: This option describes the Wurtz-Fittig reaction correctly. In this reaction, an aryl halide and an alkyl halide are condensed in the presence of sodium to form an aryl-alkyl compound.
- One molecule of each of aryl-halide and phenol: Phenols are not involved in the Wurtz-Fittig reaction, as it only involves halides. Hence, this option is incorrect.
- Two molecules of aralkyl-halides: This is not the mechanism of the Wurtz-Fittig reaction. The Wurtz reaction, when involving aralkyl halides, differs and does not specifically refer to the Wurtz-Fittig reaction.
In conclusion, the correct answer is one molecule of each of aryl-halide and alkyl-halide. The Wurtz-Fittig reaction takes advantage of the reactivity of both types of halides to form a new carbon-carbon bond in the resulting compound. This reaction is particularly useful in organic synthesis where mixed alkyl-aryl products are needed.
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Concepts Used:
Haloalkanes and Haloarenes
The hydrocarbons such as Haloalkanes and Haloarenes are the ones, in which one or more hydrogen atoms are replaced with halogen atoms. The main difference between Haloalkanes and Haloarenes is that Haloalkanes are derived from open chained hydrocarbons, also called alkanes, and Haloarenes are derived from aromatic hydrocarbons.
- Haloalkanes have hydrocarbons made up of aliphatic alkanes and one or more hydrogen atoms replaced by halogens (elements such as Chlorine, Bromine, Fluorine, Iodine, etc.) whereas, haloarenes consist of aromatic ring or rings and one or more hydrogen atoms replaced by halogens.
- In haloalkanes, the halogen atom is attached to the sp3 hybridized carbon atom of the alkyl group whereas, in haloarenes, the halogen atom is attached to the sp3 hybridized carbon atom of the alkyl group.
- Haloalkanes are saturated organic compounds where all the chemical bonds are attached to the carbon atom with single bonds and a single carbon atom is attached to the Halogen atom, whereas, the haloarenes differ from Haloalkanes by their method of preparation and properties.
- Haloalkanes are made by aliphatic alkanes by the process of free radical halogenation, whereas, haloarenes are made by direct halogenation of aromatic rings.
- Haloalkanes are odorless compounds, whereas, haloarenes have a sweet odor.
- Haloalkanes precipitate in SN2 substitution reactions, whereas, haloarenes do not precipitate in SN2 substitution reactions.
- Example of haloalkanes is CH3Cl (Methyl Chloride) and CH3CH2Br (Ethyl Bromide) and the example of haloarenes is Chlorobenzene, Bromobenzene.