In the reaction $B_2H_6 + 2KOH + 2X \to 2Y + 6H_2$,$X$ and $Y$ are respectively

In $B_2H_6$:

In the reactions $I$ and $II$,the covalencies of $Be$ and $Al$ in $X$ and $Y$ are respectively:
$I$ $Be(OH)_2 + NaOH \text{ (excess)} \rightarrow X$
$II$ $Al(OH)_3 + NaOH \text{ (excess)} \rightarrow Y$

Which of the following properties does not support the anomalous behavior of $Boron$?

Boric acid is polymeric due to

Maximum number of atoms which are present in one plane of $H_3BO_3$?