Three cyclic structures of monosaccharides are given below. Which of these represent anomers?


1. I and II     
2. II and III
3. I and III   
4. III is anomer of I and II

Hint: Anomers differ from each other in their structure at first carbon

Anomers  are the cyclic structures of monosaccharides which differ in the structure at carbon-1 are known as anomers.
Here, I and ll are anomer because they differ from each other at carbon- 1 only.