$\begin{array}{1 1} In\; (CH_3)_3 N,N \text{atom involves } Sp^3 \;hybridization \\ In\;N(SiH_3)_3 N \text{atom involves } Sp^2 \;hybridization \\ (CH_3)_3 N,N \; and \;N(SiH_3)_3 \text{are tetrahedral} \\ Geometry of \; (CH_3)_3 N \text{is tetrahedral} \end{array} $
