What is the total number of chiral carbons present in glucopyranose and fructofuranose respectively?

5 and 4

The correct answer is Option (2) → 5 and 4

Let’s count the chiral (asymmetric) carbon atoms in each cyclic sugar.

Glucopyranose

• Open-chain glucose has 4 chiral carbons (C2–C5).
• On cyclisation to glucopyranose, C1 (anomeric carbon) also becomes chiral.
• Total chiral carbons = 5

Fructofuranose

• Open-chain fructose has 3 chiral carbons (C3–C5).
• On cyclisation, C2 (anomeric carbon) becomes chiral.
• Total chiral carbons = 4