NEET 2007 Chemistry question

The order of decreasing reactivity towards an electrophilic reagent, for the following : (a) Benzene (b) Toluene (c) Chlorobenzene (d) Phenol would be

(1)d > b > a > cCorrect
(2)a > b > c > d
(3)b > d > a > c
(4)d > c > b > a

Answer: (1)

Solution

Electrophilic aromatic substitution is faster when the ring is more electron rich. The group of phenol is a strong activating group (+M effect), the methyl group of toluene is a weak activator (+I, hyperconjugation),

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Question ID VK-089875