Compounds having same molecular formula but different connectivity of atoms or groups are called structure isomers. Structrue isomers are futher classify according to their dissimilarities.
In the following skelton `Z` can be, if the molecular formula is `C_(5)H_(10)O_(2)`:
`CH_(3)-CH_(2)-undersetunderset(Z)(|)(CH)-CH_(3)`
(i)A carboxylic acid , (ii)An ester
(iii)Hydroxyaldehyde , (iv)Alkanediol
A. i & ii
B. iii & iv
C. i & iv
D. ii ^ iii