The order of decreasing reactivity towards an electrophilic reagent, for the following: [AIPMT (S) 2007] |
(i) Benzene |
(ii) Toluene |
(iii) Chlorobenzene and |
(iv) Phenol would be: |
A) (i) > (ii) > (iii) > (iv)
B) (ii) > (iv) > (i) > (iii)
C) (iv) > (iii) > (ii) > (i)
D) (iv) > (ii) > (i) > (iii)
Correct Answer: D
Solution :
[d] Benzene having any activating group i.e., OH, R etc., undergoes electrophilic substitution very easily as compared to benzene itself. Thus toluene (C6H5CH3), phenol (C6H5OH) undergo electrophilic substitution very readily than benzene. Chlorine with +E and +M effect deactivates the ring due to strong -I effect. So, it is difficult to carry out the substitution in chlorobenzene than in benzene, so correct order is |
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