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  • Which of the following structures is the most preferred and hence of lowest energy for SO3?<stro

Which of the following structures is the most preferred and hence of lowest energy for SO3?

Option: 1


Option: 2


Option: 3


Option: 4


Answers (1)

best_answer

For a given species, Formal charges help in the selection of the lowest energy structure from a number of possible Lewis structures. The lowest energy structure means the structure with the smallest formal charge on each atom of the compound. A Lewis dot structure is preferable when all formal charges are zero.                                                                                     \\ \text{Formal charge on an atom} \ = \\ =\text{total no. of valence electrons}\ -\ \text{non-bonding electrons} \ - \frac{1}{2} \times \text{bonding electrons}.

For Lewis structure of SO3,

Formal charge on S atom =  6 - 0 - 1/2 x 12 = 0

Formal charge on three O atoms  =  6 - 4 - 1/2 x 4 = 0

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Pankaj

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