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In which of the following ortho/para substitution by an electrophile is very facile?
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a
Nitrobenzene
b
phenol
c
Benzoic acid
d
Acetophenone
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Correct option is B
+ME groups increases the electron density at ortho and para positions and hence the incoming electrophile preferible to attack at ortho and para positions than at meta position.–ME groups(-NO2,-CHO,-COCH3) decreases the electron density at ortho and para positions, so when compare with O,P-positions at meta position electron density is more, therefore the incoming electrophile preferibly chooses to attack at meta position.Talk to our academic expert!
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