The following carbohydrate is
The following carbohydrate is
Show Hint
There is hydrogen at first carbon (Anomeric C) for aldohexose while alkyl group for ketohexose.
a ketohexose
- an aldohexose
an α-furanose
an α-pyranose
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.
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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Concepts Used:
Biomolecules
Biomolecules are the most essential organic molecules, which are involved in the maintenance and metabolic processes of living organisms. These non-living molecules are the actual foot-soldiers of the battle of sustenance of life.
There are four major classes of Biomolecules – Carbohydrates, Proteins, Nucleic acids and Lipids.
- Carbohydrates are chemically defined as polyhydroxy aldehydes or ketones or compounds which produce them on hydrolysis.
- Proteins are another class of indispensable biomolecules, which make up around 50per cent of the cellular dry weight. Proteins are polymers of amino acids arranged in the form of polypeptide chains. The structure of proteins is classified as primary, secondary, tertiary and quaternary in some cases.
- Nucleic acids refer to the genetic material found in the cell that carries all the hereditary information from parents to progeny. There are two types of nucleic acids namely, deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). The main function of nucleic acid is the transfer of genetic information and synthesis of proteins by processes known as translation and transcription.
- Lipids are organic substances that are insoluble in water, soluble in organic solvents, are related to fatty acids and are utilized by the living cell.