Question

Glucose is an example of:
A. Aldohexose
B. Ketohexose
C. Aldopentose
D. Ketopentose

Answer 1

Hint: In bio-molecular chemistry aldo means aldehyde functional group and keto means ketone functional group. Pentose means the carbohydrate contains five carbons in its structure. Hexose means the carbohydrate contains six carbon atoms in its structure.

Complete step by step solution:
- In the question it is given to find that glucose belongs to which category among the given options.
- To know about the glucose we should draw the structure of the glucose first.
- The structure of the glucose is as follows.

- First we have to identify the functional group present in the glucose.
- On the top most of the structure of the glucose we can see the functional group present in the glucose is an aldehyde. Then glucose is an aldose.
- Now count the number of carbons present in the structure of the glucose.
- The number of carbons present in the structure of the glucose is 6.
- Means Glucose is a hexose.
- Glucose contains aldehyde functional groups in its structure and contains six carbons in its structure.
- Therefore glucose is also called Aldohexose.

So, the correct option is A.

Note: If the carbohydrate contains ketone functional group and six carbons in its structure then it is called ketohexose.
If the carbohydrate contains an aldehyde functional group and five carbons in its structure then it is called aldopentose.
If the carbohydrate contains ketone functional group and five carbons in its structure then it is called ketopentose.