How many coordinate bonds does an HClO2 molecule have?



How many coordinate bonds does an HClO2 molecule have?


Good question!

As per the book “General, Organic, and Biological Chemistry” by H. Stephen Stoker; the following can be said.

A special case of electron sharing exists in which one atom participating in a covalent bond supplies two electrons to the bond and the other atom supplies zero electrons to the bond. This can occur when one atom, the donor, has a nonbonding pair of electrons and the other atom, the acceptor, has two vacancies in its valence electron shell. Bonds of this type are called coordinate covalent bonds. A coordinate covalent bond is a covalent bond In which both electrons in a shared pair of electrons come from one of the two atoms in the bond.

The molecule HOCIO (HCIO2) is an example of a coordinate-covalent-bond-containing molecule. Its formation can be envisioned as resulting from the addition of an oxygen atom. which has six valence electrons, to a HOCI molecule.

Combining these two entities together produces the HOClO molecule through coordinate covalent bond formation that involves the Cl atom of HOCl and the new O atom.

You can have a look at this extract from the book.