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10. Biomolecules — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry10. Biomolecules1 Mark
MCQ
The following carbohydrate is
  • A
    A Ketohexose
  • ✓
    An aldohexose
  • C
    An $\alpha  - $ uranose
  • D
    An $\alpha  - $ pyranose
✓

Answer

Correct option: B.
An aldohexose
b
Hint: There is hydrogen at first carbon (Anomeric $C$ ) for aldohexose whereas alkyl group for ketohexose.

Explanation

Since there are six carbons in the carbohydrate, it is a hexose. Also, there is hydrogen at anomeric carbon that is the first carbon.Anomeric $C$ is the new chiral center formed after cyclization.It is the cyclic form of D-glucose and as glucose has aldehyde functionality so it is the aldohexose.

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