What is the correct order of melting points for the elements of group $13$?

The tendency of $BF_3$,$BCl_3$ and $BBr_3$ to behave as Lewis acid decreases in the sequence

Give the chemical reaction for the preparation of a borax bead.

Which compound is not a monobasic acid?

$B(OH)_3 + NaOH \to NaBO_2 + Na[B(OH)_4] + H_2O$
How can this reaction be made to proceed in the forward direction?

The correct statement$(s)$ for orthoboric acid $(H_3BO_3)$ is/are:
$(A)$ It behaves as a weak acid in water due to self-ionization.
$(B)$ Acidity of its aqueous solution increases upon addition of ethylene glycol.
$(C)$ It has a three-dimensional structure due to hydrogen bonding.
$(D)$ It is a weak electrolyte in water.