Three moles of $B _2 H _6$ are completely reacted with methanol. The number of moles of boron containing product formed is

$(i)\,Al\,\xrightarrow{{{N_2}}}\,A$         $(ii)\,Al\,\xrightarrow{c}\,B$

Here $A$ and $B$ on hydrolysis respectively gives

Which of the following equation is not correctly matched

What happens when

$(a)$ Borax is heated strongly,

$(b)$ Boric acid is added to water,

$(c)$ Aluminium is treated with dilute $NaOH$,

$(d)$ $BF_3$ is reacted with ammonia?

Compare $\pi  - $ bond strength between $B$ and $N$ given in two compounds

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

Borax has the molecular formula