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Question

The order decreasing reactivity towards an electrophilic reagent for the following compound is:
(a) Benzene
(b) Toluene
(c) Chlorobenzene and
(d) Phenol


A
d>b>a>c
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B
a>b>c>d
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C
b>d>a>c
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D
d>c>b>a
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Solution

The correct option is B $$d > b > a > c$$
Benzene having any activating group i.e $$OH,R$$ etc under goes electrophilic substitution very easily as compared to benzene itself.
Thus toluene, phenol undergo electrophilic substitution very readily than benzene.
 Chlorine with $$+E$$ and $$+M$$ effect (delocalized) deactivates the ring due to strong $$-I$$ effect.So, it is difficult to carry out the substitution in chlorobenzene than in benzene.
Hence, option $$A$$ is correct.

972314_70649_ans_c4bb89b12c9a4da7944b9e0455805724.PNG

Chemistry

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