Draw the structure of the unknown with the molecular formula C7H10 that matches the following descriptions:
(i) Unknown X gives cycloheptane upon catalytic hydrogenation. It produces a three-carbon and a four-carbon dialdehyde upon ozonolysis followed by reduction with dimethyl sulfide.
(ii) Unknown Y gives bicyclo[3.2.0]heptane upon catalytic hydrogenation. It produces a cyclopentane with a one-carbon aldehyde group on C-1 and another on C-2 upon ozonolysis followed by reduction with dimethyl sulfide.