Question

Assertion: Fructose is a reducing sugar.
Reason: It has a ketonic group
A. Both assertion and Reason are correct and Reason is the correct explanation for Assertion.
B. Both assertion and Reason are correct but Reason is not the correct explanation for Assertion.
C. Assertion is correct bur Reason is incorrect.
D. Both assertion and reason are incorrect.

Answer 1

Hint: Reducing sugar means the carbohydrate which has a capability to act as reducing agent because of the presence of an aldehyde or ketone functional group. The reducing sugars react with Fehling’s solution and form a reddish-brown color precipitate.

Complete Solution :
- In the question it is given that Fructose is a reducing sugar as an assertion and it has a ketone group in reason.
- We have to find whether the assertion and reason are correct or not.
- To check the assertion and reason we should draw the structure of fructose.
- The structure of the fructose is as follows:

- Coming to Assertion, Fructose is a reducing sugar. Yes it is true fructose reacts with Fehling’s solution and forms a reddish brown ppt.
- So, Assertion is correct.
- Coming to Reason, it has a ketone functional group. Yes it is also correct in the above structure we can find the presence of a ketone group in the structure.
 -So, Reason is also correct.
- Therefore both Assertion and reason are correct but Reason is not the correct explanation for Assertion.
So, the correct answer is “Option B”.

Note: Fructose is a carbohydrate containing six carbons in its structure and it is a reducing sugar and comes under the category of ketoses. It is found in fruits and vegetables. The pure form of fructose was used as a sweetener from the 1850s.