Question

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

Answer 1

Hint– Glucose contains six carbon atoms and an aldehyde group. Its general chemical formula is $$C_6{H}_{12}{O}_6$$ .It is an organic compound.

Complete answer:
We have been asked about glucose as an example of which of the following among the given options.
Glucose is a simple sugar; its general chemical formula is $$C_6{H}_{12}{O}_6$$ .It is an organic compound and contains six carbon atoms and an aldehyde group.
For better understanding refer the structure of D- glucose shown below-

The above structure is of D-glucose, i.e., Dextrorotatory glucose. It is one of the two stereoisomers of glucose. As, we can see the above structure contains 6 carbon atoms, 12 hydrogen atoms and 6 oxygen atoms. The structure has an aldehyde group and a hexose (6 C atoms).
Now, let us see what is the meaning of aldohexose, ketohexose, aldopentose and ketopentose.
Aldohexose: Aldohexose is a monosaccharide whose molecular structure contains both an aldehyde (an aldose) and six carbons (a hexose).
Ketohexose: A ketohexose is also a monosaccharide having a ketone functional group in its structure and 6 six carbon atoms.
Aldopentose: Aldopentose is a five-carbon monosaccharide which also contains an aldehyde group at position 1.
Ketopentose: Ketopentose is also a five-carbon monosaccharide which has a ketone group at position 2.
So, as we have already mentioned above that glucose contains an aldehyde group, i.e. an aldose and six carbons, i.e. a hexose.
Therefore, we can say that glucose is an example of aldohexose.

Hence, the correct option is A. Aldohexose.

Note– Whenever such types of questions appear, then first know what is glucose and study its structure. And then as mentioned in the solution, we have written about aldohexose, ketohexose, aldopentose and ketopentose, and then we can see the structure of glucose has an aldehyde group as well as 6 carbons, which implies that it is an example of aldohexose.