A sugar 'X' dehydrates very slowly under acidic condition to give furfural which on further reaction with resorcinol…
Biomolecules · Class 12 · JEE Main Previous Year Question
A sugar 'X' dehydrates very slowly under acidic condition to give furfural which on further reaction with resorcinol gives the coloured product after sometime. Sugar 'X' is
- a✓
Aldopentose
- b
Aldotetrose
- c
Oxalic acid
- d
Ketotetrose
Aldopentose
Step 1: Furfural Formation — Furfural is formed by the acid-catalyzed dehydration of pentoses (five-carbon sugars).
Step 2: Identifying the Sugar Type — Aldopentoses dehydrate slowly to furfural, whereas ketopentoses react much faster in similar tests (like ).
Step 3: Conclusion — Since 'X' is a pentose that forms furfural slowly, it is classified as an aldopentose.
Key Point: Furfural derivatives are common intermediates in various qualitative tests for carbohydrates.
Practice this question with progress tracking
Want timed practice with adaptive difficulty? Solve this question (and hundreds more from Biomolecules) inside The Crucible, our adaptive practice platform.
More JEE Main Biomolecules PYQs
Which of the following is the correct structure of L-fructose?
Identify the number of structure/s from the following which can be correlated to D-glyceraldehyde.
Identify correct conversion during acidic hydrolysis from the following: (A) starch gives galactose. (B) cane sugar gives equal amount of glucose and fructose. (C) milk sugar gives glucose and…
Fat soluble vitamins are: A. Vitamin B1 B. Vitamin C C. Vitamin E D. Vitamin B12 E. Vitamin K Choose the correct answer from the options given below:
Which of the following acids is a vitamin?