a
\(\text{N}{{\text{F}}_{3}}+{{\text{H}}_{2}}\text{O}\to {{S}_{{{N}^{1}}}}\)                    \(\text{NC}{{\text{l}}_{3}}+{{\text{H}}_{2}}\text{O}\to {{S}_{{{N}^{2}}}}\)

(b) \({{\text{P}}_{4}}{{\text{O}}_{10}}\to {{\text{S}}_{{{N}^{AE}}}}\)        \(\text{SiC}{{\text{l}}_{4}}\to {{\text{s}}_{{{N}^{2}}}}\)

\((c)\)  \(\mathrm{SF}_{4}, \mathrm{TeF}_{6}\rightarrow\) Both \(S_{N^{2}}\)

\((d)\)  \(\mathrm{SiCl}_{4}, \mathrm{SiF}_{4}, \rightarrow\) Both \(S_{N^{2}}\)