p-Block elementsHard

Question

B(OH)3 + NaOH → Na[B(OH)4] (aq).
Then addition of which of the following proceeds the reaction in the forward direction.

Options

A.Glecerol
B.Mannitol
C.Catachol
D.Ethanol

Solution

cis-diols form very stable complex with [B(OH)4]-,
Thus removing it from solution
HB(OH)4 + 2    ⇋  + H+ + 4H2O.

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