(a) In each of the following parts select the species having the greater resonance stabilisation
`H_(2)C =Oand underset(O^(Theta))underset(|)HC=O`
(ii) `HNO_(3)` and `NO_(3)^(Theta)`
(b) Draw all possible octet structural formulas for `N_(3)^(Theta)` Which ones are possible resonance forms ? .

Explanation

` underset(O^(Theta))underset(|)HC=O` has two equal resonance forms, as shown
`H_(2)C=O` does not have other resonance forms as low in energy
(ii) `NO_(3)^(Theta)` has three equal energey resonance forms `HNO_(3)` has only two, since the O-atom bonded to the H-atom is not equivalent to the others
(b) The possible linear structures are shown as In Two resonance structures (II) and (III) one of e terminal N-atom in an isolated `N_(3)^(Θ)` ion should be different from the other The structure (IV) although satisfies octel rule is ruled out as a reasonace form because the atoms are in different positions. Moreover, The structure (IV) has considerable strain
.