The strongest oxidizing agent among the halogens is ‘X’. The strongest reducing agent among the halides is ‘Y’. ‘X’ and ‘Y’ are

B.D.E….Cl₂ > Br₂ >F₂ > I₂ 

Hydration enthalpy…F^- > Cl^- > Br^- > I^-

Due to high hydration enthalpy of F^- and low B.D.E of F₂, F₂ is the strongest oxidant and highly reactive;

Reactivity and oxidizing power…..F₂ > Cl₂> Br₂ > I₂;

SRP Values of ${\mathrm{E}}_{\frac{1}{2}{\mathrm{F}}_2/{\mathrm{F}}^{-}}^0\left(+2.87 \mathrm{V}\right) > {\mathrm{E}}_{\frac{1}{2}{\mathrm{Cl}}_2/{\mathrm{Cl}}^{-}}^0\left(+1.36 \mathrm{V}\right) > {\mathrm{E}}_{\frac{1}{2}{\mathrm{Br}}_2/{\mathrm{Br}}^{-}}^0\left(+1.08 \mathrm{V}\right) > {\mathrm{E}}_{\frac{1}{2}{\mathrm{I}}_2/{\mathrm{I}}^{-}}^0\left(+0.54 \mathrm{V}\right)$;

Reducing power….I^- > Br^- > Cl^- > F^- ;

Ion of strong reducing agent is weak oxidizing agent and vice-versa