Question

Pentoses are distinguished by which of the following test?

• A. Molish test
• B. Bial's test
• C. Selwinoff's test

Hint:

Bial's = Blue-green for Pentoses.

Answer 1

The Correct Option is B

Step 1: Concept
Specific chemical tests are used to identify and distinguish different classes of carbohydrates.

Step 2: Meaning
Bial's test involves heating the sugar with orcinol and hydrochloric acid in the presence of ferric chloride.

Step 3: Analysis
Pentoses (5-carbon sugars) react to form a blue-green color. Selwinoff's test is for ketoses, Molisch is a general test for carbohydrates, and Benedict's is for reducing sugars.

Step 4: Conclusion
Bial's test is specifically utilized for the detection and differentiation of pentoses.

Final Answer: (B)