Treatment of phenol with cold dilute nitric acid gives

Treatment of phenol with dilute nitric acid gives

Reaction of zinc with cold and dilute nitric acid yields

How does the nitration of phenol with dilute nitric acid differ from nitration of phenol with conc, nitric acid in the presence of sulphuric acid?

The treatment of zinc with very dilute nitric acid produces:

The treatment of zinc with very dilute nitric acid produces:

Which of the following evolve hydrogen on reacting with cold dilute nitric acid ?