Chemistry - Halogen Derivative Question with Solution | TestHub

Reactivity
$\propto$electron deficiency at carbon atom of carbonyl group
$\propto$electron withdrawing groups (-I, -R)
$\propto \frac{1}{\mathrm{e}\mathrm{l}\mathrm{e}\mathrm{c}\mathrm{t}\mathrm{r}\mathrm{o}\mathrm{n }\mathrm{r}\mathrm{e}\mathrm{l}\mathrm{e}\mathrm{a}\mathrm{s}\mathrm{i}\mathrm{n}\mathrm{g }\mathrm{g}\mathrm{r}\mathrm{o}\mathrm{u}\mathrm{p}\mathrm{s}(+\mathrm{I},+\mathrm{R})}$
$\propto \frac{1}{\mathrm{s}\mathrm{t}\mathrm{e}\mathrm{r}\mathrm{i}\mathrm{c }\mathrm{h}\mathrm{i}\mathrm{n}\mathrm{d}\mathrm{r}\mathrm{a}\mathrm{n}\mathrm{c}\mathrm{e}}$
Using these concepts the correct order of reactivity is given as
II > III > I.