Question

Where we should put an arrow to represent Coordinate bond in O3?

Answer 1

A coordinate bond in ozone?

Explanation:

We would normally represent the bond ozone molecule with formal charge separation.....i.e.

`O=stackrel(ddot)O^(+)-O^(-)`; from left to right as we face the page, each oxygen atom has `8`, `7`, and `9` electrons associated with that centre, and hence the formal charge designation, as each oxygen nucleus necessarily has 8 positive nuclear charges. Of course the charges can be distributed over the entire molecule by resonance, but the central oxygen in the molecule is `sp_2-"hybridized"` to a first approx. with `/_O-O-O<=120^@`, about `117^@`.