Is a chemical bond flexible or rigid?

Answer 1

Covalent bonds are "flexible", a bit like a spring, BUT the energy to make them vibrate is quantised and only specific frequencies (often in the infred spectrum) are "allowed"- this si the basis of IR and Raman vibrational spectroscopy.

Answer 2

Chemical bonds can exhibit flexibility or rigidity depending on the types of atoms involved and their arrangement in the molecule. Covalent bonds are typically more rigid, while hydrogen bonds may be more flexible. Overall, the strength and flexibility of a chemical bond are determined by the nature of the interacting atoms and the forces between them.