Which concept describes the formation of four equivalent, single, covalent bonds by carbon in its compounds that resembles methane, ch4?

Carbon is special and unique because it is able to form different compounds with a lot of elements, including itself. When it bonds with itself, this is possible because of the concept of hybridization. It is the mixing of atomic orbitals into a new hybrid orbital. In this case, methane is formed through the sp³ hybridization.