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.