Answer:
The corrects answer is last option.
The empirical formula of a compound = [tex]CH_2[/tex]
For determining the molecular formula, we need to determine the valency which is multiplied by each element to get the molecular formula.
The equation used to calculate the valency is :
[tex]n=\frac{\text{molecular mass}}{\text{empirical mass}}[/tex]
[tex]{\text{Molecular mass}=\text{Empirical mass}\times n[/tex]
Molecular formula will determined by multiplying the 'n' with subscript numbers of carbon and hydrogen in the empirical formula.
[tex]{\text{Molecular formula}=C_{n\times 1}H_{n\times 2}[/tex]
