Question

Consider the reaction given below: 
 

\(\text{A gives positive Fehling's test. Choose the correct relation}\). 
 

• A. Molar weight of A and molar weight of B are same
• B. Molar weight of A is greater than molar weight of B
• C. Molar weight of B is greater than molar weight of A
• D. None of these

Hint:

Fehling's test is used to test for aldehydes. The reduction of the aldehyde group typically results in the formation of a product with a higher molar mass.

Answer 1

The Correct Option is C

Step 1: Understanding Fehling's test.
Fehling's test is a qualitative test used to differentiate between aldehydes and ketones, based on the ability of aldehydes to reduce Fehling's solution. The test is positive for aldehydes, indicating the presence of a reducing group. Step 2: Analyzing the reaction.
Given the reaction, A undergoes an acid-catalyzed reaction to give products A and B. Since A gives a positive Fehling's test, it must contain an aldehyde group. Step 3: Conclusion.
Typically, the product B formed in such a reaction, after the reduction of the aldehyde group, will have a higher molar mass compared to the original aldehyde compound A. Hence, the molar weight of B is greater than the molar weight of A. Final Answer:} Molar weight of B is greater than molar weight of A.