Cyclic Structure

An optically active compound having molecular formula C_(6)H_(12)O_(6) is found in two isomeric forms [A] and [B] in nature. When [A] and [B] are dissolved in water, they show the following equilibrium. {:(,[A],hArr,"equilibrium mixture",hArr,B),([alpha]_(D)=,111^(@),," "52.2^(@),,19.2^(@)):} (i) What are such isomers called ? (ii) Can they be called enantiomers ? Justify your answer. (iii) Draw the cyclic structure of anomer [A].

How many cyclic structural isomer of C_(5)H_(10) are possible

How many cyclic structural isomers are possible from C_4 H_6 :-

Find out the total number of cyclic structural isomers of C_(6)H_(12) .