The Reactions of OH<sup>−</sup>, O<sup>−</sup>, CF<sub>3</sub><sup>−</sup>, F<sup>−</sup>, and O<sup>−</sup><sub>2</sub> with C<sub>2</sub>H<sub>4</sub>, C<sub>2</sub>H<sub>3</sub>F, C<sub>2</sub>H<sub>2</sub>F<sub>2</sub>, C<sub>2</sub>HF<sub>3</sub> and C<sub>2</sub>F<sub>4</sub>