Question

what is the hybridisation of CF3

Answer 1

Having 3 sigma bonds in a similar manner to CH3 free radical it should also have hybridisation sp2. However, if we look at its shape, it is pyramidal and not planar unlike CH3 free radical(which is sp2 hybridised) which signifies that it should have sp3 hybridisation.
Hope it helps

Answer 2

I think it is sp2 hybridisation
If one s orbitol and two p orbitols are present then it is called sp2 hybridisation