Predict the directive influence of -OH group in Benzene ring

Presence of a nitro group in a benzene ring

predict the direction of net reaction in the following cases: Qc Qc > Kc Qc = Kc

Which of the following statements are correct? 1.In Sandmeyer reaction nucleophile like Cl^- , Br^- and CN^- are introduced in benzene ring in the presence of Cu^+ ion (ii) In Galtermann reaction nucleophiles are introduced in benzene ring in the presence of copper powder and HCI 3. The yield in Gattermann reaction is found to be better than Sandmeyer reaction .

Is there any difference in the resonance effect of -NH_2 group and -NO_2 group on benzen ring? Justify it.

Assertion: Bromobenzene upon reaction with Br_2//Fe gives 1,4-dibromobenzene as the major product. Reason : In bromobenzene, the inductive effect of the bromo group is more dominant than the mesomeric effect in directing the incoming electrophile.