Which of the following is not traid of homologous series.

Options

A. `CH_(3)NH_(2), (CH_(3))_(2)NH,(CH_(3))_(3)N`
B. `Ph-OH,Ph-CH_(2)-CH,Ph-CH_(2)-CH_(2)-OH`
C. `HCOOH,CH_(3)COOH,CH_(3)COOCH_(3)`
D. none of these

Answer

ABC

Explanation

`(A) 1^(@) ,2^(@)` and `3^(@)` amines are functional groups isomers.
(B) phenol and Alcohol are functional groups isomer of each other.
(C) acid and Ester are functional group isomers.