Answer

  1. None of the above

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$\begin{array}{*{20}{c}}
  {\,\,\,\,\,H} \\ 
  {\,\,\,\,\,\,|} \\ 
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\end{array}$

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$(I)$  $\begin{array}{*{20}{c}}
  {{{(C{H_3})}_3}Si - NB{H_2}} \\ 
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|} \\ 
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\end{array}$         $(II)$   $\begin{array}{*{20}{c}}
  {{{(C{H_3})}_3}C - NB{H_2}} \\ 
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|} \\ 
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\end{array}$

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