Which amongst the following is a compound Methane Mercu

SOLUTION

Compounds are formed when atoms of different elements combine in a definite whole number ratio.

Amongst the given options, methane $\left({\text{CH}}_4\right)$ is a compound while mercury $\left(\text{Hg}\right)$, iron $\left(\text{Fe}\right)$ and copper $\left(\text{Cu}\right)$ are elements.