Answer
a) organic
b) organic
c) inorganic
d) inorganic
Work Step by Step
a) $C_8H_{18}$ is an organic compound because it is made up of carbon, & hydrogen.
b) $CH_3NH_2$ is an organic compound because it is made up of carbon, oxygen, & nitrogen.
c)$CaO$ is an inorganic compound because it does not contain carbon.
d) $FeCO_3$ is an inorganic compound because carbonates are considered to be inorganic.
