Hydrocarbons Ques 76
76. The order of decreasing reactivity towards an electrophilic reagent, for the following would be
[2007]
(i) benzene
(ii) toluene
(iii) chlorobenzene
(iv) phenol
(a) $(ii) > (iv) > (i) > (iii) $
(b) $(iv) > (iii) > (ii) > (i)$
(c) $(iv) > (ii) > (i) > (iii) $
(d) $(i) > (ii) > (iii) > (iv)$
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Answer:
Correct Answer: 76.(c)
Solution:
- (c) Electrophiles have high affinity for electrons. They attack at the site where electron-density is highest. Electron donating groups increases the electron density. The electron donating tendency decreases in the order :
$ -OH>-CH_3>-H>-Cl $
Therefore, the correct order of reactivity towards electrophile is
$ C_6 H_5 OH>C_6 H_5 CH_3>C_6 H_6>C_6 H_5 Cl $
BETA
