Which among the following reagents is called as Hinsberg's reagent?

Which among the following amines has highest value of $$\mathrm{pK}_{\mathrm{b}}$$ ?

Benzonitrile on reduction with stannous chloride in presence of hydrochloric acid followed by acid hydrolysis forms:

Identify the product obtained when benzonitrile is reduced by stannous chloride in presence of hydrochloric acid followed by acid hydrolysis.