Which of the foolowing carbohydrate is not a polysaccharide Glycogen Amylose Amylopectin Isomaltose Cellulose?

It is isomaltose.

Isomaltose is a disaccharide not a polysaccharide.

If you think about it, maltose is a disaccharide and isomaltose contains the Word maltose, so if I was given this question and didn't know what isomaltose was, just try linking it to other basic information you already know! :)