Question
Chemistry Question on Biomolecules
A sugar ‘X’ dehydrates very slowly under acidic conditions to give furfural which on further reaction with resorcinol gives the coloured product after some time. Sugar ‘X’ is
A
Aldopentose
B
Aldotetrose
C
Oxalic acid
D
Ketotetrose
Answer
Aldopentose
Explanation
Solution
The correct answer is (A):
This is based on Seliwamoff's test, which is used to distinguish between aldoses and Kotoses. Ketoses give this test more rapidly than aldoses because they are more rapidly dehydrated than aldoses.