Question

In which compounds are there just sigma covalent bonds?

A.CH4

B. C2H2

C. C2H4

D. C5H12

Answer 1

A sigma bond (σ bond) is a bond formed by the overlap of orbitals in an end-to-end fashion, with the electron density concentrated between the nuclei of the bonding atoms.

Answer: A.CH₄

In methane the carbon atom is bonded to four hydrogen atoms through four single bonds; each single bond is also a sigma bond, which means that methane has a total of 4 sigma bonds.