Question

When carbon forms four covalent bonds, what is the orbital hybridization?

Answer 1

`sp^3` hybrid orbitals

Explanation:

This is a good explanation of the hybridization.
http://chem.libretexts.org/Core/Organic_Chemistry/Fundamentals/Hybrid_Orbitals

We know that the hybridization takes place because all four bonds are the same, hybridization makes for four equal `sp^3` orbitals rather than s or p orbitals.