Question

Which one of the following is the correct statement?

• A. Boric acid is a protonic acid
• B. Both $Tl^{3 +}$ and $Al^{3 +}$ ions act as oxidizing agent in aqueous solution.
• C. Hydrogen bonding in $H_{3}BO_{3}$ gives it a layered structure.
• D. $B ( OEt )_{3}$ imparts blue colour to the burner flame.

Answer 1

Answer: (C)

It acts as a lewis acid by accepting eletrons from a hydrogen ion and it turn releases $H^{+}$ ions

$Tl^{+ 3}$ acts as on oxidizing agent $Al^{+ 3}$ acts as reducing agent because the stability of lower oxidation state on moving down the group in increases due to pair effect stability $Tl^{+ 3}$ pair effect stability $Tl^{+ 1}>Tl^{+ 3}$

Hydrogen bonding in H 3 B O 3 gives it a layered structure.

$B ( OEt )_{3}$ imparts green colour to the burner flame.