Question:
Which of the following types of reactions is used to prepare Alkyl benzene?
Which of the following types of reactions is used to prepare Alkyl benzene?
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Wurtz-Fittig reaction couples an aryl halide with an alkyl halide using sodium in dry ether.
Updated On: Oct 1, 2026
- Swartz reaction
- Sandmeyer reaction
- Finkelstein reaction
- Wurtz Fittig reaction
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
Alkyl benzenes (benzene with an alkyl side chain) are made by joining an aryl group to an alkyl group.
Step 2: Recall the reaction:
In the Wurtz-Fittig reaction, an aryl halide and an alkyl halide react with sodium metal in dry ether:
\[ \text{C}_6\text{H}_5\text{Br} + \text{CH}_3\text{Br} + 2\text{Na} \xrightarrow{\text{dry ether}} \text{C}_6\text{H}_5\text{CH}_3 + 2\text{NaBr} \]
Step 3: Why the other options are wrong.
The Swarts reaction makes alkyl fluorides. The Sandmeyer reaction converts a diazonium salt into an aryl halide or nitrile using Cu(I) salts. The Finkelstein reaction makes alkyl iodides from alkyl chlorides or bromides using NaI in acetone.
Final Answer:
Alkyl benzenes are prepared by the Wurtz-Fittig reaction. \[ \boxed{\text{(D) }\text{Wurtz Fittig reaction}} \]
Alkyl benzenes (benzene with an alkyl side chain) are made by joining an aryl group to an alkyl group.
Step 2: Recall the reaction:
In the Wurtz-Fittig reaction, an aryl halide and an alkyl halide react with sodium metal in dry ether:
\[ \text{C}_6\text{H}_5\text{Br} + \text{CH}_3\text{Br} + 2\text{Na} \xrightarrow{\text{dry ether}} \text{C}_6\text{H}_5\text{CH}_3 + 2\text{NaBr} \]
Step 3: Why the other options are wrong.
The Swarts reaction makes alkyl fluorides. The Sandmeyer reaction converts a diazonium salt into an aryl halide or nitrile using Cu(I) salts. The Finkelstein reaction makes alkyl iodides from alkyl chlorides or bromides using NaI in acetone.
Final Answer:
Alkyl benzenes are prepared by the Wurtz-Fittig reaction. \[ \boxed{\text{(D) }\text{Wurtz Fittig reaction}} \]
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