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

Question 39: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.

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

The correct answer is -a. (A): CCl3COOH (B): CH3COOH
b. CH3COOH (i)Red P / Cl2 CCl3COOH, Hell Volhard Zelinsky reaction (ii)H2O
c. CH3COCl H2O CH3COOH
d. A will be more acidic due to presence of 3 Cl groups (electron withdrawing groups)
which increase acidity of carboxylic acid.
e. CH3COOH (i)NaOH, CaO (ii) heat CH4 + Na2CO3