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Which of the following shapes of \( S F_{4} \) is more stable and why? (i)

1. (i) Lone pair at axial position is stable
2. (ii) Lone pair at equatorial position is stable
3. Both are equally stable due to \( l p \) -bp repulsion
4. Both are unstable since \( S F_{4} \) has tetrahedral shape

Correct answer: (ii) Lone pair at equatorial position is stable

Solution

In SF4, the electron-pair geometry is trigonal bipyramidal. A lone pair prefers an equatorial site because it has only two 90° interactions, while an axial lone pair would experience three 90° interactions, making it less stable.

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