The cyclic form of sugars

Question

a. has one more chiral center (the anomeric carbon) than the open-chain form.

b. loses a chiral center compared to the open-chain form.

c. is not usually found in nature.

d. has one more carbon atom than the open-chain form.

e. has one less carbon atom than the open-chain form.

Answer 1

You are gaining a chiral center. closing the ring turns an aldehyde group into an alcohol group that is now chiral.