\[\ce{\underset{\text{Methanamine}}{CH3 – NH2} ->[NaNO2/HCl][273 – 278K][CH3 – N^+2Cl-]->[H2O]CH3OH->[PCl5]CH3Cl ->[Ethanolic NaCN]CH3CN ->[Na/C2H5OH]\underset{\text{Ethanamine}}{CH3CH2NH2}}\]