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 $\ce{-CH_3,-NH_2,-NO_2, -CN, -CONH2}$ etc. or not?

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    $\begingroup$ Nitro and cyano will react $\endgroup$ – Waylander Aug 25 '17 at 15:52
  • $\begingroup$ @Waylander Please explain, in detail about the reactions. Answer with examples if possible. $\endgroup$ – Shoubhik R Maiti Oct 2 '17 at 7:40
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    $\begingroup$ Zinc plus proton source and heating is a standard way of reducing aromatic nitro. I have run this with ammonium chloride as the proton source in methanol $\endgroup$ – Waylander Oct 2 '17 at 9:18
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    $\begingroup$ @Waylander, I understand. But can you give the whole reaction? I mean, a NO2 group can be reduced to NHOH or NH2 group, and CN group can be reduced to CH=NH, or CH2NH2 groups. $\endgroup$ – Shoubhik R Maiti Oct 10 '17 at 7:59
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    $\begingroup$ I think at this point you should do you own research into the reductive properties of zinc. $\endgroup$ – Waylander Oct 10 '17 at 12:17

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