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10. Biomolecules — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry10. Biomolecules1 Mark
MCQ
Natural glucose is termed $D-$ glucose because
  • A
    $- OH$ on the second carbon is on the right side in Fischer projection
  • B
    $- OH$ on the sixth carbon is on the right side in Fischer projection
  • ✓
    $- OH$ on the fifth carbon is on the right side in Fischer projection
  • D
    It is dextrorotatory
✓

Answer

Correct option: C.
$- OH$ on the fifth carbon is on the right side in Fischer projection
c
Fisher gave the prefix $'D''$ to compounds whosebottom chiral hasits $OH$ to the right. So natural glucoseis called $D\,-$ glucose is called $D\,-$ glucose or dextrose.

Structure of $D\,-$ glucose :

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