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
- Aldopentose
- Aldotetrose
- Oxalic acid
- Ketotetrose
The Correct Option is A
Solution and Explanation
To solve this question, we need to understand the dehydration reaction that leads to the formation of furfural.
The question states that sugar ‘X’ dehydrates very slowly under acidic conditions to form furfural, which is indicative of a specific type of sugar. Let's analyze the options given:
- Aldopentose: An aldopentose is a monosaccharide containing five carbon atoms and an aldehyde group. Under acidic conditions, aldopentoses can dehydrate to form furfural. This is a typical reaction for sugars like arabinose and xylose.
- Aldotetrose: An aldotetrose contains four carbon atoms and an aldehyde group. These sugars do not typically dehydrate to form furfural.
- Oxalic acid: This is not a sugar but a dicarboxylic acid, and it does not form furfural.
- Ketotetrose: A ketotetrose is a monosaccharide with four carbon atoms and a ketone group. These do not typically form furfural under acidic conditions.
From the analysis above, the correct answer is aldopentose since it aligns with the dehydration reaction forming furfural.
Conclusion: Thus, the correct answer is Aldopentose as it can dehydrate to form furfural, which further reacts to give the colored product.
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