Describe the shapes of ${\mathrm{BF}}_3$ and ${\mathrm{BH}}_4^{-}.$ Assign the hybridisation of boron in these species.

Write balanced equation for : 

${\mathrm{B}}_2{\mathrm{H}}_6 + {\mathrm{H}}_2\mathrm{O} \to$

Write balanced equation for: 

${\mathrm{H}}_3{\mathrm{BO}}_3\stackrel{∆}{\to }$

Write balanced equation for: 

${\mathrm{B}}_2{\mathrm{H}}_6 + {\mathrm{NH}}_3 \to$