The following structure represents
α-D-fructofuranose
β-D- fructopyranose
α-D-fructopyranose
β-D-fructofuranose
It is a five membered ring….furanose ring;
At C-2 position….-OH on top and -CH2OH at bottom…..β-D-fructose;
It is β-D-fructofuranose