Question

In a reaction,

 reagents ' X ' and ' Y ' respectively are :

• A. \(CH _3 OH / H ^{+}, \Delta and CH _3 OH / H ^{+}, \Delta\)
• B. \(\left( CH _3 CO \right)_2 O / H ^{+}and CH _3 OH / H ^{+}, \Delta\)
• C. \(\left( CH _3 CO \right)_2 O / H ^{+} and \left( CH _3 CO \right)_2 O / H ^{+}\)
• D. \(CH _3 OH / H ^{+}, \Delta and \left( CH _3 CO \right)_2 O / H ^{+}\)

Hint:

Recognize the functional groups involved and the type of reaction taking place. Fischer esterification is a common method for preparing esters from carboxylic acids or phenolic OH groups.

Answer 1

The Correct Option is B

Step 1: Analyze the Reaction from B to C (Reagent ‘X’)
The transformation from B to C involves the esterification of the phenolic \(-\text{OH}\) group. 
This can be achieved using acetic anhydride (\((\text{CH}_3\text{CO})_2\text{O}\)) in the presence of an acid catalyst (\(\text{H}^+\)). This reaction is known as Fischer esterification.
Step 2: Analyze the Reaction from B to A (Reagent ‘Y’)
The transformation from B to A involves the esterification of the carboxylic acid group (\(-\text{COOH}\)) with methanol (\(\text{CH}_3\text{OH}\)) in the presence of an acid catalyst (\(\text{H}^+\)) and heat (\(\Delta\)). This is also a Fischer esterification.
Conclusion
The reagents X and Y are \((\text{CH}_3\text{CO})_2\text{O}/\text{H}^+\) and \(\text{CH}_3\text{OH}/\text{H}^+, \Delta\),.