Question

Do all the molecules contain only single bonds?

Answer 1

no not all molecules contain only single bonds because they all have different shapes

Answer 2

No. All molecules do not contain only single bonds.

For example, the molecules of carbon dioxide (O=C=O) and ethylene (H₂C=CH₂) contain double bonds.

The molecules of hydrogen cyanide (H-C≡N) and acetylene (H-C≡C-H) contain triple bonds.