$H_{3}PO_{3}$ can be represented by structures $1$ and $2$ shown below. Can these two structures be taken as the canonical forms of the resonance hybrid representing $H_{3}PO_{3}$? If not,give reasons for the same.

(N/A) The given structures cannot be taken as the canonical forms of the resonance hybrid of $H_{3}PO_{3}$ because the positions of the atoms have changed.
In resonance,only the positions of electrons (pi electrons or lone pairs) can change,while the positions of the atomic nuclei must remain fixed.
In the provided structures,the hydrogen atom is bonded to different atoms (phosphorus in one and oxygen in the other),which violates the fundamental rule of resonance.