The calculated covalent radius of fluorine from C – F bond length is least in case of

Compound                                              C−F  Bond  length(Å)CH3F                                                                                             1.385CH2F2                                                                                      1.357CHF3                                                                                           1.332CF4                                                                                                   1.319 ⇒Tetra- fluoro methane, also known as carbon tetra fluoride is the simplest fluorocarbon. It has a very high bond strength due to nature of the carbon-fluorine bond.