Chemistry

Problem

Three nonequivalent Lewis structures are proposed for SO

_2

(a neutral molecule with 18 valence electrons). I. O=S=O (both S–O bonds are double). II.

^{\!-}

O–S≡O

^{\;+}

(left S–O single, right S–O triple). III.

^{\!-}

O–S=O (one S–O single, one S–O double; sulfur carries +1 formal charge). Which structure is predicted to contribute most to the resonance hybrid? a) II only b) I and III contribute equally c) I only d) III only

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