A) \[-N{{H}_{2}}\]
B) \[-OH\]
C) \[-X\] (Halogens)
D) \[-R\] (Alkyl groups)
Correct Answer: C
Solution :
Electron accepting groups which make the substitution difficult are known or deactivating groups. o. p. directing groups are as follow : \[-C{{H}_{3}},{{C}_{2}}{{H}_{5}}(-R),-N{{H}_{2}},-OH\], halogens \[(Cl,\,Br,\,I)\].
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