Which reagent is used in the conversion of phenol to picric acid?

Identify the reactivity order for halogens towards alkanes.

What is the total number of tetrahedral voids in 0.6 mole of compound that forms hcp structure?

Identify name of reaction when aldehyde or ketone react with $\mathrm{Zn}-\mathrm{Hg} /$ conc. HCl to give alkane.