sentences:  The wide range is due to the sensitivity of the stretching frequency to other substituents in the molecule.Monofluorinated compounds have a strong band between 1000 and 1110 cm−1; with more than one fluorine atoms, the band splits into two bands, one for the symmetric mode and one for the asymmetric.The carbon–fluorine bands are so strong that they may obscure any carbon–hydrogen bands that might be present.