Question

Which from followings is true regarding structure of glucopyranose ?

• A. Six membered heterocyclic ring containing five carbon and one oxygen atom
• B. Five membered heterocyclic ring containing four carbon and one oxygen atom
• C. Six membered heterocyclic ring containing six carbon atoms
• D. Five membered homocyclic ring containing five carbon atoms

Hint:

Glucopyranose has a six-membered ring made of five carbons and one oxygen, like pyran.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept
In the cyclic form, glucose forms a hemiacetal between the C-1 aldehyde group and the C-5 hydroxyl group.

Step 2: Ring formed
The ring contains C-1 to C-5 and one oxygen atom, which gives six atoms in all: five carbons and one oxygen.

Step 3: Name
This ring resembles pyran, so the form is called glucopyranose. C-6 stays outside the ring as \(\text{CH}_{2}\text{OH}\).

Final Answer:
Glucopyranose is a six-membered heterocyclic ring of five carbon atoms and one oxygen atom. \[ \boxed{\text{(A) }\text{Six membered heterocyclic ring containing five carbon and one oxygen atom}} \]