Total number of cyclic geometrical isomers possible with the formula, C5H10 is ‘X’. Total number of cyclic optical isomers possible with the formula, C5H10 is ‘Y’. Difference between X and Y is

Number of structurally isomeric cycloalkanes = 5 ;Number of structurally isomeric cyclic compounds= 5 ;Number of cyclic stereo isomers = 3 ;cis 1,2-dimethyl cyclo propane (meso) and trans 1,2-dimethyl cyclo propane (d and l);Total number of cyclic isomers = 7 ;