Compounds having the same molecular formula but different structures are classified as structural isomers. Structural isomerism include chain, position, functional, group isomerism and metamerism.
answer the following questions on the basis of above paragraph :
(i) What is functional isomerism ?
(ii) `CH_(3)OC_(3)H_(7)` and `C_(2)H_(5)OC_(2)H_(5)` represent which type of isomers ?

Explanation

(i) In this type of isomerism, the isomers having the same molecular formula have different functional groups and also belong to different families. For details, consult section 12.20.
(ii) these are regarded as metamers since they differ in the nature of the alkyl groups the same functional group.