Which molecule has a covalent band?

Answer 1

When atoms have a similar electronegativity, (Tendency to take electrons) they can't form ionic compounds where one becomes positive (gives an electron or some of them) and the other negative (takes that electrons).

Instead they share it with other atoms in covalent bonds (both are neutral).

Most organic compounds are covalent-bonded, like methane, ethane, propane, butane, isobutane, ethanol.

Other non organic molecules that are covalent are diatomic molecules (O2, H2, Cl2), ammonia...