In topscore, test 2, o-chem question #86.. Why is sucrose non-reducing? Doesn't the fructose ring in it have a free hemiacetal group? i know lactose is considered a reducing sugar.. what about it makes it a reducing one when compared to sucrose? i know the basic definition is that there is an aldehyde group it can open up to, but i dont understand it in this case. And why is fructose considered a ketohexafuranoside? did they mean the sucrose instead? i understand the furan part since it has 5 carbons, but what does the hexa- prefix have to do with anything? thanks for any help!