SATHEE: Chemical Bonding and Molecular Structure

Chemical Bonding and Molecular Structure - Result Question 14

####14. Which of the following structures is the most preferred and hence of lowest energy for $S O_{3}$ ? (a)O=S1(=O)CCCS1

(b)

(c)O=S1(=O)C=CC1

(d)O=S(=O)(O)Cl

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Solution:

(d) The lowest energy structure is the one with the smallest formal charges on the atoms.

Option (b) and (c) are not possible structures of $S O_{3}$ .

Formal charge $=$ total no. of valence $e^{-}$ in the free atom - total no. of non-bonding (lone pair) $e^{-} - \frac{1}{2}$ (total no. of bonding $e^{-}$ ).

Formal charge on $S$ stom $= 6 - 0 - \frac{1}{2} (8) = + 2$

Similarly, formal charges on coordinated bonded oxygen atom and covalently bonded oxygen atom are -1 and 0 respectively.

Formal charge on $S$ atom

$= 6 - 0 - \frac{1}{2} (12) = 0$

Formal charge on $O$ atom

$= 6 - 4 - \frac{1}{2} (4) = 0$

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Chemical Bonding and Molecular Structure - Result Question 14

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