The number of chiral carbons present in sucrose is .

Question

The number of chiral carbons present in sucrose is  .

Canvas Classes · Accepted Answer

Counting chiral carbons in sucrose:

Sucrose = -D-glucose (pyranose) + -D-fructose (furanose) linked at C1 of glucose and C2 of fructose.

-D-Glucopyranose unit:

| Carbon | Chiral? |
|---|---|
| C1 (anomeric, involved in glycosidic bond) | Yes ✓ |
| C2 | Yes ✓ |
| C3 | Yes ✓ |
| C4 | Yes ✓ |
| C5 | Yes ✓ |
| C6 (–CH₂O–) | No |

Glucose contributes 5 chiral carbons

-D-Fructofuranose unit:

| Carbon | Chiral? |
|---|---|
| C1 (–CH₂OH) | No |
| C2 (anomeric, involved in glycosidic bond) | Yes ✓ |

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