Answer
a) $CH_{3}$
b) $NO_{2}$
c) $C_{2}H_{3}O$
d) $NH_{3}$
Work Step by Step
The empirical formula of a compound represents the simplest whole number ratio of the atoms present in that compound.
For Example, in case of $C_{2}H_{6}$, the empirical formula would be $CH_{3}$ because the simplest whole number ratio of 2:6 is 1:3.
