Which of the following is the best method for preparing of only 2° amine?
1
\(CH_3CI \ + NH_3 \ \xrightarrow {3CH_3CI}\)
2
\(CH_3CI \ \xrightarrow{KCN}\ \xrightarrow{Sn/HCI}\)
3
\(CH_3NH_2 \ \xrightarrow[\Delta]{CHCl_3/KOH}\)\(\ \xrightarrow[]{Sn/HCl}\)
4
Both (2) and (3)