Which of the following statements regarding boric acid is false -

• Correct answer
  A

  It acts as a tribasic acid
• B

  It has a planar structure
• C

  It acts as a monobasic acid
• D

  It is soluble in hot water

Solution

$\left(\mathrm{A}\right)$ Boric acid ${\mathrm{H}}_3\mathrm{B}{\mathrm{O}}_3$ is a lewis acid,when it is dissolved in water, it accepts $\mathrm{O}{\mathrm{H}}^{-}$ from water rather than donating ${\mathrm{H}}^{+}$ to the water. So, $\left(\mathrm{A}\right)$ it is false.

$\left(\mathrm{B}\right)$ It has a planar structure.


$\left(\mathrm{C}\right)$ It acts as a monobasic acid: $\mathrm{B}(\mathrm{OH}{)}_3+{\mathrm{H}}_2\mathrm{O}\to \mathrm{B}(\mathrm{OH}{)}_4^{-}+{\mathrm{H}}^{+}$

$\left(\mathrm{D}\right)$ It is soluble in hot water.

Hence, the correct answer is option: 'A'.