question_answer

Which set of terms correctly identifies the carbohydrate shown?

1. Pentose

2. Hexose

3. Aldose

4. Ketose

5. Pyranose

6. Furanose

A) 1, 3 and 6                     

B) 1, 3 and 5

C) 2, 3 and 5                     

D) 2, 3 and 5          

Correct Answer: A

Solution :

This compound contains five carbon atoms, so it is a pentose. Its first carbon contains -H and -OH group. This suggests that it is an aldose (ie, contains aldehyde group). Since its structure is similar to furan (a heterocyclic compound), so it has furanose structure. Hence, this compound is a pentose, aldose and have furanose structure.