Number of stereo centers present in linear and cyclic structures of glucose are respectively:

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Stereocenters in glucose:

Linear (open-chain) glucose ():

Structure: CHO–CHOH–CHOH–CHOH–CHOH–CH₂OH

| Carbon | Stereocentre? |
|---|---|
| C1 (CHO) | No — aldehyde carbon, not chiral |
| C2 | Yes ✓ |
| C3 | Yes ✓ |
| C4 | Yes ✓ |
| C5 | Yes ✓ |
| C6 (CH₂OH) | No — two H atoms |

Linear glucose: 4 stereocentres (C2, C3, C4, C5)

Cyclic (pyranose) glucose:

When glucose cyclizes, C1 (the aldehyde carbon) becomes a new chiral centre (the anomeric carbon):

| Carbon | Stereocentre? |
|---|---|
| C

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