Question

The statements true about $\beta$-D-(+) Glucopyranose, are:

• A. It is a cyclic structure of glucose
• B. It is dextrorotatory because 'D' is placed before name of it
• C. It is an anomer of $\alpha$-D-(+) Glucopyranose
• D. Pyranose naming is due to it's anology with pyrane

Answer 1

Answer: (A), (C), (D)

The correct options are
A It is a cyclic structure of glucose
C It is an anomer of $\alpha$-D-(+) Glucopyranose
D Pyranose naming is due to it's anology with pyrane

It can be seen from structure that, its a cyclic structure of glucose.
It is an anomer of $\alpha$-D-(+) Glucosepyranose.
Also, pyrane ring is a six memebered ring with 1 atom as oxygen. Hence, it has an analogy with pyrane.
D and L configurations depend only upon the placement of OH group in fisher model of a sugar. It cannot decide optical rotation.