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JEE Main levelSingle correct optionDifficulty 2 of 3pb018

In crystalline orthoboric acid, the planar $B (OH) X_{3}$ units are linked into sheets by

Aionic bonds between $B X^{3 +}$ and $OH X^{-}$
Bhydrogen bonds, with the sheets held together by weak van der Waals forces
Ccovalent $B - B$ bonds
Dthree-centre two-electron bonds

Answer: B

Each

B (OH) X_{3}

unit is planar (

s p^{2}

boron) and hydrogen bonds join the units into two-dimensional layers. The layers are held weakly together, which gives the flaky, soapy texture.

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