A reducing sugar is any sugar that either has an aldehyde group or is
capable of forming one in a reaction thru isomerism. The first example
that should come to mind is glucose, which can form a <span>β(1→4)</span>
linkage. Sucrose, on the otherhand, is a non-reducing sugar. And is
bascially the opposite of a reducing sugar. It doesn't form or have
aldehydes in a basic environmet.Hope this helps!!