Orthoboric acid in aqueous medium is

Which of the following represents the structure of inorganic benzene?

Which of the following substances is formed when $BCl_3$ reacts with water?

$A$ certain salt $X$ gives the following results:
$(i)$ Its aqueous solution is alkaline to litmus.
$(ii)$ It swells up to a glassy material $Y$ on strong heating.
$(iii)$ When conc. $H_{2}SO_{4}$ is added to a hot solution of $X,$ white crystals of an acid $Z$ separate out.
Write equations for all the above reactions and identify $X, Y,$ and $Z$.

In the following reaction,assign the state for the underlined atom for the product of complete hydrolysis at $R.T.$:
$H_4\underline{B}_2O_6 + H_2O \longrightarrow H_3BO_3 + H_2O_2$

Diborane reacts with ammonia under different conditions to give a variety of products. Which one among the following is not formed in these reactions?