We use distillation with zinc dust to remove -OH group from phenol. $$\ce{Ph-OH + Zn \rightarrow Ph-H + ZnO }$$
What I want to know is that whether this reaction has any effect on other groups attached to the benzene ring, like $\ce{-CH_3,-NH_2,-NO_2, -CN, -CONH2}$$\ce{-CH_3,-NH_2,-NO_2,-CN,-CONH2}$ etc. or not?