Identify B formed in the reaction. \( \mathrm{Cl-(CH_2)_4-Cl} \xrightarrow{\text{excess } \mathrm{NH_3}} \mathrm{A} \xrightarrow{\mathrm{NaOH}} \mathrm{B} + \mathrm{H_2O} + \mathrm{NaCl} \)
\(\text{Cl}\overset{+}{\text{N}}\text{H}_3-(\text{CH}_2)_4-\overset{+}{\text{N}}\text{H}_3\text{Cl}^-\)
\( \mathrm{H_2N-(CH_2)_4-NH_2} \)