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Question:
The following carbohydrate is
The following carbohydrate is
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There is hydrogen at first carbon (Anomeric C) for aldohexose while alkyl group for ketohexose.
Updated On: Feb 9, 2023
a ketohexose
- an aldohexose
an α-furanose
an α-pyranose
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The Correct Option is B
Approach Solution - 1
As the carbohydrate has six carbons, it is a hexose. Also, it has hydrogen at anomeric carbon (first carbon).
- Anomeric C is the new chiral centre that is formed after cyclization.
- It is the cyclic form of D-glucose.
- As glucose has aldehyde functionality, the structure is aldohexose.
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Approach Solution -2
Carbohydrates are polysaccharides.
- In the question, we first need to identify the given structure and then explain the name carbohydrate.
- The beta position of the compound is the position where the functional group is attached in the same direction.
- The alpha position is in which the functional group is attached in the opposite direction.
- In the given structure, the beta position is present as the -OH group at 1st carbon and 5th carbon are attached to the same upper direction as shown -
Hence, options C and D are incorrect.
Now, between options A and B, a hexose is a 6-membered ring structure, also known as furanose.
- Now, the 'Aldo' group is used when an aldehyde group is present and the 'keto' is used when the functional group ketone i.e. -C=O is present.
- So, at the 6th carbon, the aldehyde group is attached due to which the complete name of the compound becomes aldohexose.
Therefore, the correct option is (B).
Note: For the keto group there should be the presence of a double bond between carbon and oxygen that was not present.
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