Structure of OSF4

Recently I had given a test where I was asked to specify the hybridisation of $\ce{OSF4}$ and its structure. I guessed that the structure would be trigonal bipyramidal, but I was unsure since I hadn't dealt with molecules with double bonds.

So my first question is: Should having double bonds in the structure affect my geometry considerations of the structures or will it be the same as in structures only containing single bonds (say $\ce{PCl5}$) ?

Also, if I am supposed to draw its structure then where would I place the double bonded oxygen? Axial or equatorial position? Why? I know that when lone pairs are considered they are placed at the equatorial position (after considering repulsions). Is there anything common in this case?

• The Trigonal Bipyramidal is right. There would be a linear F-S-F through the apex of the bipyramid. In the plane I'd expect the O-S-F bond to be larger than the F-S-F bond. See: en.wikipedia.org/wiki/Thionyl_fluoride – MaxW Nov 10 '15 at 7:24
• @Jan. Your improvements on my edits noted. Will take care. – Shailesh Nov 10 '15 at 13:34