Answer:
Option 2 is correct = CH₃
Step-by-step explanation:
Empirical formula:
It is the simplest formula gives the ratio of atoms of different elements in small whole number .
For example:
C₂H₆
The simplest small whole number for C₂ is one and H₆ is 3. Thus empirical formula is CH₃.
Other options are incorrect.
Some more examples:
S₂O₂
The simples positive number for S and O is 1, thus its empirical formula is SO. The 1 is usually not written with symbol in formula.