Which structural isomerism is exhibited by the following pairs :
(i) `CH_(3)-overset(O)overset("||")(C)-OH` and `H-overset(O)overset("||")(C)-O-CH_(3)`
(ii) `CH_(2) =CHOH` and `CH_(3)-overset(O)overset("||")(C)-H`
(iii) `CH_(3)-CH_(2)-CH=CH_(2)` and `CH_(3)-CH=CH-CH_(3)`
(iv) `CH_(3)-CH_(2)-CH_(2)-NH_(2)` and `CH_(3)-underset(NH_(2))underset("|")(CH)-CH_(3)`

Explanation

(i) Functional isomerism, (ii) Tautomerism
(iii) Position isomerism, (iv) Position isomerism