Θ H C-SNa +CH CH -X -> The reaction is fastest when X is:

O || 3 O C CF Has negative charge delocalized. Over oxygen the negative charge is delocalized because there are three fluorine atoms present on the carbon atom as fluorine atom is electron withdrawing group. 124. The reactivity order of halides for dehydrohalogenation is (a) R–F > R–Cl> R–Br > R–I (b) R–I > R–Br > R–Cl> R–F (c) R–I > R–Cl> R–Br > R–F (d) R–F > R–I > R–Br > R–Cl The reactivity of halides for dehydrohalogenation depends on the quality of the leaving group. If the halide is a good leaving group, then the reactivity increases. Dehydrohalogenation is the elimination of HX or