Question
Write resonance structures of $H – COO^–$ and comment on their relative stability.

Answer

$i.$ First the detailed bond structure of $H – COO^–$ showing all the valence electron is drawn and then other resonance structures are generated using curved arrow to show movement of $\pi -$electrons.
$ii.$ Two resonance structures are written for $H – COO^–.$
Image
Both the resonance structures $I$ and $II$ are equivalent to each other, and therefore, are equally stable.

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