An organic compound (A) with molecular formula C2Cl3O2H is obtained when (B) reacts with Red P and Cl2. The organic compound (B) can be obtained on the reaction of methyl magnesium chloride with dry ice followed by acid hydrolysis. Identify A and B. Write down the reaction for the formation of A from B. What is this reaction called? Give any one method by which organic compound B can be prepared from its corresponding acid chloride. Which will be the more acidic compound (A) or (B)? Why? Write down the reaction to prepare methane from the compound (B).

(A): CCl3COOH (B): CH3COOH \[\ce{CH3COOH ->[(i) Red P/Cl2][(ii) H2O] CCl3COOH,}\]Hell Volhard Zelinsky reaction \[\ce{CH3COCl ->[H2O] CH3COOH}\] A will be more acidic due to presence of 3Cl groups (electron withdrawing groups) which increase acidity of carboxylic acid. \[\ce{CH3COOH ->[(i) NaOH, CaO (ii) Heat] CH4 + Na2CO3}\]

An organic compound (A) with molecular formula C2Cl3O2H is obtained when (B) reacts with Red P and Cl2. - Chemistry

Question

An organic compound (A) with molecular formula C₂Cl₃O₂H is obtained when (B) reacts with Red P and Cl₂. The organic compound (B) can be obtained on the reaction of methyl magnesium chloride with dry ice followed by acid hydrolysis.

Identify A and B.
Write down the reaction for the formation of A from B. What is this reaction called?
Give any one method by which organic compound B can be prepared from its corresponding acid chloride.
Which will be the more acidic compound (A) or (B)? Why?
Write down the reaction to prepare methane from the compound (B).

Short Note

Solution

(A): CCl₃COOH (B): CH₃COOH
\[\ce{CH3COOH ->[(i) Red P/Cl2][(ii) H2O] CCl3COOH,}\]Hell Volhard Zelinsky reaction
\[\ce{CH3COCl ->[H2O] CH3COOH}\]
A will be more acidic due to presence of 3Cl groups (electron withdrawing groups) which increase acidity of carboxylic acid.
\[\ce{CH3COOH ->[(i) NaOH, CaO (ii) Heat] CH4 + Na2CO3}\]