How does our planet look like, first?
For some reason - and I really can't think of a good one, perhaps some extreme fractionation in a nebula - we have no oxygen around. Oxygen messes things up in this case. Instead we have Fluorine, which is always more fun.
So instead of rocks, we have Silicon fluoride rocks (Si(n)F(2n)F2). Instead of oceans of water, we have oceans of HF. And instead of an oxygen atmosphere, we have a Fluorine atmosphere. The surface temperature would be something like -100 degrees centigrade - this does help by lowering reaction rates.
Organic chemistry is hard in this environment. It would have to be based around Carbon-Fluorine polymers, which would be stable, as opposed to our Carbon-Hydrogen-Oxygen polymers, which would react violently. Presumably some trace oxygen and nitrogen would have to be available to allow more diverse chemistry; the interior of cells would have to do a lot of work to avoid the HF destroying everything.
The equivalent of CO2 in this world would be CF4 gas, which would be reacted through photosynthesis into C(n)F(2n) polymers with F2 being released. This is one of the more straightforward parts, although you'd want very high energy wavelengths of light to drive it, so perhaps our plants would look red rather than green.
One thing I would not want to do is try and land on this planet..