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.

Identify '$$A$$' in the following reaction:

A $$\mathrm{\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{ether}^{LiAl{H_4}}}}$$ Ethanamine