Question

which formula represents an ionic compound?
cufe
ch₄
alcl₃

Explanation:

Ionic compounds are formed by the transfer of electrons between a metal and a non - metal. Aluminum ($Al$) is a metal and chlorine ($Cl$) is a non - metal in $AlCl_3$. $CuFe$ is an alloy (a mixture of metals), and $CH_4$ is a covalent compound formed by the sharing of electrons between carbon and hydrogen.

Answer:

C. $AlCl_3$