polar covalent, non polar covalent, ionic, hydrogen, peptide in rank of strength

In terms of bond strength, you can rank these types of bonds as follows:

Ionic bonds: Generally the strongest among these due to the complete transfer of electrons from one atom to another, resulting in strong electrostatic attractions.

Covalent bonds (polar and nonpolar): Covalent bonds involve the sharing of electrons. Polar covalent bonds are intermediate in strength, as the electrons are shared unevenly between atoms. Nonpolar covalent bonds are relatively weaker, with electrons shared more equally.

Hydrogen bonds: These are weaker than covalent bonds and are formed when a hydrogen atom is attracted to a highly electronegative atom (usually nitrogen, oxygen, or fluorine) in a different molecule.

Peptide bonds: These are specific to the bonding between amino acids in proteins. While peptide bonds are crucial for the structure of proteins, they are not as strong as the other bonds listed above.

Remember that bond strength can vary based on specific atoms involved, molecular context, and environmental conditions.