Sucrose: α-D-glucose C1 – O – C2 β-D-fructoseसूक्रोस: α-D-ग्लूकोस C1 – O – C2 β-D-फ्रक्टोसSucrose: α-D-glucose C1 – O – C2 β-D-fructose
NCERT Sucrose (10.1.3) · Class 12 Chemistry · Chapter 10 · interactive diagram
Parts and what they mean
- α-D-Glucopyranose unit (α-D-ग्लूकोपाइरैनोस इकाई) — Six-membered ring. Its anomeric C-1 forms the glycosidic bond.
- β-D-Fructofuranose unit (drawn turned round) (β-D-फ्रक्टोफ्यूरैनोस इकाई (घुमाकर बनाई)) — Five-membered ring, drawn rotated so that its C-2 faces the glucose. Turning a ring over in the plane swaps up and down for every group.
- Glycosidic linkage: C-1 (glucose) – O – C-2 (fructose) (ग्लाइकोसाइडी बंध: C-1 (ग्लूकोस) – O – C-2 (फ्रक्टोस)) — Two monosaccharides join through an oxygen atom with loss of a water molecule. In sucrose the link joins the anomeric carbons of BOTH units.
- Non-reducing sugar (अनपचायी शर्करा) — No free aldehyde or keto group can form, so sucrose does not reduce Fehling’s or Tollens’ reagent.
- –OH groups of the glucose unit (ग्लूकोस इकाई के –OH समूह) — C-2 down, C-3 up, C-4 down — as in free α-D-glucose.
- C-6 (CH₂OH) of glucose (ग्लूकोस का C-6 (CH₂OH)) — Up (D-sugar).
- –OH groups of the fructose unit (फ्रक्टोस इकाई के –OH समूह) — Because the ring is turned round, C-3 –OH now appears down and C-4 –OH up.
- C-1 (CH₂OH) of fructose (फ्रक्टोस का C-1 (CH₂OH)) — Attached to the anomeric C-2.
- C-6 (CH₂OH) of fructose (फ्रक्टोस का C-6 (CH₂OH)) — Appears down because the ring is turned round.
Original diagram drawn by Simple Learning Hub, based on NCERT Sucrose (10.1.3). Report a mistake