Question:
Complete the following reaction sequence and give the name of major product 'P'.
Complete the following reaction sequence and give the name of major product 'P'.
Updated On: Apr 12, 2026
- 2-Chloropropanoic acid
- 3-Chloropropanoic acid
- 1-Chloropropane
- 2-Chloropropane
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
The sequence involves the complete hydrolysis of a nitrile to a carboxylic acid, followed by the Hell-Volhard-Zelinsky (HVZ) reaction.
Step 2: Detailed Explanation:
Steps (i) and (ii): Nitriles ($R-CN$) undergo complete hydrolysis in the presence of acid or base and heat to form carboxylic acids.
$CH_3CH_2CN \xrightarrow{H_2O/OH^-/\Delta, H^+} CH_3CH_2COOH$ (Propanoic acid).
Steps (iii) and (iv): Carboxylic acids with $\alpha$-hydrogens react with $Cl_2/Red P$ followed by hydrolysis to substitute the $\alpha$-hydrogen with a chlorine atom. This is the HVZ reaction.
$CH_3CH_2COOH \xrightarrow{Cl_2/Red P, H_2O} CH_3CH(Cl)COOH$ (2-Chloropropanoic acid).
Step 3: Final Answer:
The major product P is 2-chloropropanoic acid.
The sequence involves the complete hydrolysis of a nitrile to a carboxylic acid, followed by the Hell-Volhard-Zelinsky (HVZ) reaction.
Step 2: Detailed Explanation:
Steps (i) and (ii): Nitriles ($R-CN$) undergo complete hydrolysis in the presence of acid or base and heat to form carboxylic acids.
$CH_3CH_2CN \xrightarrow{H_2O/OH^-/\Delta, H^+} CH_3CH_2COOH$ (Propanoic acid).
Steps (iii) and (iv): Carboxylic acids with $\alpha$-hydrogens react with $Cl_2/Red P$ followed by hydrolysis to substitute the $\alpha$-hydrogen with a chlorine atom. This is the HVZ reaction.
$CH_3CH_2COOH \xrightarrow{Cl_2/Red P, H_2O} CH_3CH(Cl)COOH$ (2-Chloropropanoic acid).
Step 3: Final Answer:
The major product P is 2-chloropropanoic acid.
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