Give the decreasing order of the relative reactivity towards `SE` reaction of the following compounds.
a. I. Benzene, II. Phenol, III. Aniline, IV. Chlorobenzene
b. I. Acetannilide, II. Aniline, III. Acetep[jempme, IV. Benzene.
c. I. 1,3- Dimryhyl benzene, II. `1,4-` Dimenthyl-benzene, III. Tolune, IV. Trimehtyl benzene, V. `1,3,5-` Trimethtyl benzene
d. I. `p-` Mehtyl benzoic acid, II. Terephtalic acid, III. `p-` Xylene, IV. Toluene.
e. I. Benzene, II. Toulene, III. `p-`Nitrotoulene, IV. `m-` Nitroluence, V. Benzence
g. I. Flurobenzene, II. Chlorobenzene, III. Bromobenzene, IV. Iodobenzene
h. I. `p-` Nitrochlorobenze II. Chlorobenzene, III. `2.4-` Dintrochlorobenzene

Explanation

a. `(III) gt (II) gt (I) gt (IV) (PhNH_(2) gt PhOH gt PhH gt Ph-Cl)`
Reactiving of `- NH_(2) gt -OH gt -H gt -C,`
b. `(II) gt (I) gt (IV) gt (III)`
c. `(V) gt (II) gt (I) gt (III) gt (IV)`

d. `(III) gt (IV) gt (I) gt (II)`

e. `(II) gt (III) gt (IV) gt (V) gt (I)`

f. `(I) gt (II) gt (V) gt (IV) gt (III)`
Explanation: Hyperconjugative effect is stronger at `o-` adnd p-` positions than at `m-` position. So, the reactivity of ``(I) gt (II). overline(e)` withdrawing by resonance of `(-NO_(2))` is stronger at `o-` and `p-` positons than at `m-` positon. The deactivating effect is more at `o-` and `p-` positons, so the reactivity of `(IV) gt (III).
g. `(IV) gt (III) gt (II) gt (I) (ph - Br gt PhCl gt Phf)` Reactivity at `I gt Br gt Cl gt F` (both `-I` and `+R` effects) [Illustration `11.18 (f)`].
h. `(II) gt (I) gt (III)`