Question:
Identify the product obtained when acetonitrile reacts with methyl magnesium chloride in dry ether followed by acid hydrolysis.
Identify the product obtained when acetonitrile reacts with methyl magnesium chloride in dry ether followed by acid hydrolysis.
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A Grignard reagent adds to a nitrile and acid hydrolysis of the imine intermediate gives a ketone.
Updated On: Nov 12, 2026
- Propion aldehyde.
- Ethyl methyl Ketone.
- Acetone.
- Acetaldehyde.
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
Nitriles react with Grignard reagents to give ketones after hydrolysis.
Step 2: Addition step
\(\text{CH}_3\text{C}\equiv\text{N}+\text{CH}_3\text{MgCl}\rightarrow\text{CH}_3\text{-C(=NMgCl)-CH}_3\)
Step 3: Hydrolysis
The imine adduct is hydrolysed by aqueous acid: \(\text{CH}_3\text{-C(=NMgCl)-CH}_3\xrightarrow{\text{H}_3\text{O}^{+}}\text{CH}_3\text{-CO-CH}_3\)
Step 4: Name the product
\(\text{CH}_3\text{COCH}_3\) is acetone (propanone).
Final Answer:
The product is acetone. \[ \boxed{\text{(C) }\text{Acetone.}} \]
Nitriles react with Grignard reagents to give ketones after hydrolysis.
Step 2: Addition step
\(\text{CH}_3\text{C}\equiv\text{N}+\text{CH}_3\text{MgCl}\rightarrow\text{CH}_3\text{-C(=NMgCl)-CH}_3\)
Step 3: Hydrolysis
The imine adduct is hydrolysed by aqueous acid: \(\text{CH}_3\text{-C(=NMgCl)-CH}_3\xrightarrow{\text{H}_3\text{O}^{+}}\text{CH}_3\text{-CO-CH}_3\)
Step 4: Name the product
\(\text{CH}_3\text{COCH}_3\) is acetone (propanone).
Final Answer:
The product is acetone. \[ \boxed{\text{(C) }\text{Acetone.}} \]
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