Biochemistry - Water, pH and Macromolecules - Discussion

It Should be Ionic bond because ionic bond have higher energy of dissociation

Covalent bonds is the answer. I agree.

It is electrovalent or ionic bonding not covalent bonding because ionic bonding are stronger than the covalent bonding.

Covalent bond is the strongest bond in the chemical bonding between atoms.

If we describe the strength of an individual bond then the ionic bond is stronger than a covalent bond. While in network structure like diamond and silica covalent bond is stronger. As well as in the question, word molecule is used (covalent bond) not the word compound (ionic bond).

So, the answer is a covalent bond here while the individual ionic bond is stronger than an individual covalent bond.

Ionic bond is much stronger than covalent bond because it involves complete transfer of electrons because of which there is formation of cation and anion and there exist huge electrostatic forces of attraction. They also have high melting and boiling point which proves that the ionic bond is very strong.