In the structure of , the lone pair of electrons on S is in:

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Step 1 — Structure of  (see-saw):
- S has 4 bonds + 1 lone pair = 5 electron pairs → trigonal bipyramidal electron geometry
- Lone pair prefers equatorial position (less repulsion — only 2 axial bonds at 90°, vs axial position which has 3 equatorial bonds at 90°)

Step 2 — Count 90° repulsions for equatorial lone pair:
In equatorial position, the lone pair makes 90° angles with the 2 axial bond pairs.

Wait — actually the equatorial lone pair has 90° interactions with 2 axial bonds AND the other

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