Draw clear conformational drawings for these molecules, labelling each substituent as axial or equatorial.

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Your drawings may look different, but make sure the rings have parallel sides, the axial bonds are vertical and the equatorial bonds are parallel to the next-ring-bond-but-one.

structure

The first molecule has a free choice, so it puts both substituents equatorial (both equatorial). The last two molecules are dominated by the tert-butyl group, which insists on being equatorial : in the second molecule that leaves F and Et equatorial as well; in the third the tert-butyl group is on the same face as F, so with tert-butyl equatorial both F and Et are forced axial.

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