$-\mathrm{OH},-\mathrm{SO}_3 \mathrm{H}$

$-\mathrm{CHO},-\mathrm{NO}_2$

$-\mathrm{COOH},-\mathrm{NO}_2$

$-\mathrm{SO}_3 \mathrm{H}_1-\mathrm{NO}_2$

(I) $<$ (II) $<$ (III) $<$ (IV)

(III) $<$ (II) $<$ (I) $<$ (IV)

(II) $<$ (I) $<$ (III) $<$ (IV)

(II) $<$ (III) $<$ (I) $<$ (IV)

$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CHBrCO}_2 \mathrm{H}$

$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{CHBrCO}_2 \mathrm{H}$

$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{CHBrCO}_2 \mathrm{H}$

$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{CHBrCOBr}$

I, II, III, IV

I, II, III only

III, IV only

I, III, IV only