NEET Solved Paper 2014 Question 55
Question: Which one of the following is a non-reducing carbohydrate? [AIPMT 2014]
Options:
A) Maltose
B) Sucrose
C) Lactose
D) Ribose 5-phosphate
Show Answer
Answer:
Correct Answer: B
Solution:
- Sucrose is a disaccharide of glucose 8 fructose. It is a non-reducing sugar as it do not contain any free anomeric carbon atom. Maltose is a disaccharide of 2 glucose units. Its first glucose residue cannot undergo oxidation, whereas, second residue can undergo oxidation because it has a reactive free anomeric carbon atom. Hence, it is a reducing sugar. Lactose and ribose-5-phosphate are also reducing in nature due to the presence of a free ketonic or aldehyde group.
