Question

Which of the following compounds would give the following set of qualitative analysis?
• (i) Fehling’s Test: Positive
• (ii) Na fusion extract upon treatment with sodium nitroprusside gives a blood red colour but not

• A.
• B.
• C.
• D.

Hint:

In organic chemistry, the presence of functional groups such as nitrogen and sulfur can influence reactions like Fehling’s test and the reaction with sodium nitroprusside. Always check for the necessary elements involved in these reactions.

Answer 1

The Correct Option is A

To determine which compound gives the specified qualitative analysis results, we need to analyze each reaction mentioned:

1. Fehling’s Test: This is a test for aldehydes. A positive result indicates the presence of an aldehyde group in the compound.
2. Sodium Nitroprusside Test: This test is for sulfhydryl groups (–SH), which react with sodium nitroprusside to give a blood-red color.

Given the set of tests, we are looking for a compound that contains both an aldehyde group and a sulfhydryl group.

Let's evaluate the options:

• Product 1: It is the correct answer as it contains both an aldehyde group and a sulfhydryl group, which matches both positive Fehling’s Test and positive sodium nitroprusside test.
• Product 2: It does not contain an aldehyde group. Hence, it would not give a positive Fehling’s Test.
• Product 3: If it does not contain a sulfhydryl group, the sodium nitroprusside test would not be positive.
• Product 4: Similar to Product 2, it does not have both necessary functional groups required for the reactions.

The combination of positive results specifically indicates the presence of both an aldehyde group and a sulfhydryl group, which is consistent with Product 1.

Therefore, the compound that gives the specified qualitative analysis is Product 1.