Diborane on hydrolysis gives 1)BC₃ 2)H₃BO₃ 3)HBO₃ 4)B₃N₃H

• Correct answer :  (2).

1. Diborane reacts with water to give boric acid and hydrogen.
2. B₂H₆ + 6 H₂O → 2 H₃BO₃ + 6 H₂.
3.  Formula of Boric acid is H₃BO₃, (it also written as B(OH)₃).                                         Orthoboric acid is a weak monobasic Lewis acid.

   Physical properties of orthoboric acid:    It is a White crystalline solid. H₃BO₃ is soft, slightly soluble in cold water but more soluble in hot water and it is a mild antiseptic in medical uses.

   Reactivity Towards H₂O: B₂H₆ reacts readily and violently with water. It is due to the fact that, water has lone pairs on oxygen, which are donated to electron-deficient boron, resultantly, the B–H bonds break and convert into B–OH bonds.