Fluorine benzene is an organic compound, the formula is c6h5f, usually abbreviated as PHF. This substance is a derivative of benzene, the fluorine atom is directly connected with the benzene ring. The melting point of the 44 ℃, lower than benzene, this is because the fluorine substituent damage the symmetry of benzene ring, so that the molecule can not be replaced by the general good stacking and crystallization of benzene. By contrast, its boiling point is only 4 ℃ to the benzene difference.