CH3-NH2 + HONO(1) ---> CH3-OH + N2 + H2O
CH3-OH + PCl5(5) --> CH3-Cl + POCl3 + HCl
CH3-Cl + KCN(2) --> CH3-C≡N + KCl
CH3-C≡N + 2H2(4) --Ni/toC--> CH3-CH2-NH2
CH3-NH2 + HONO(1) ---> CH3-OH + N2 + H2O
CH3-OH + HBr(3) --> CH3-Br + H2O
CH3-Br + KCN(2) --> CH3-C≡N + KBr
CH3-C≡N + 2H2(4) --Ni/toC--> CH3-CH2-NH2
=> corect B si C
