1.
CH4Cl2/hv(A)KCN, acetone(B)SnCl2,HCl(C)H3O+(D)\text{CH}_4 \xrightarrow{\text{Cl}_2/\text{hv}} (A) \xrightarrow{\text{KCN, acetone}} (B) \xrightarrow{\text{SnCl}_2,\,\text{HCl}} (C) \xrightarrow{\text{H}_3\text{O}^+} (D)

Product D will be: