Option (iii) is the answer.
The amount of electron releasing groups increases the reactivity of aryl halides; the fewer the electron releasing groups, the slower the rate of nucleophilic substitution becomes.
arrange the compounds in increasing order of the rate of reaction towards nucleophilic substitution.(i) (a) < (b) < (c) (ii) (b) < (a) < (c) (iii) (c) < (b) < (a) (iv) (a) < (c) < (b)
arrange the compounds in increasing order of the rate of reaction towards nucleophilic substitution.(i) (a) < (b) < (c) (ii) (b) < (a) < (c) (iii) (c) < (b) < (a) (iv) (a) < (c) < (b)