12.15. What is the relationship between the members of following pairs of structures? Are they structural or geometrical isomers or resonance contributors?
(a) They are structural isomers. The given compounds have the same molecular formula but they differ in the position of the functional group (here ketone group: first one at C-3 and second one at C-2 positions).
(b) They are geometrical isomers. Compounds having the same molecular formula, the sam