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How can the following reaction be made t...

How can the following reaction be made to proceed in forward direction ?
`B(OH)_(3) + NaOH hArr Na[B(OH)_(4)]`.

A

By the addition of `cis-1,2-diol`.

B

By the addition of borax.

C

By the addition of `trans-1,2-diol`

D

By the addition of `Na_(2)HPO_(4)`.

Text Solution

Verified by Experts

The correct Answer is:
A
`B(OH)_(3) + NaOH hArr NaBO_(2) + Na^(oplus) [B(OH)_(4)]^(Ө) + H_(2)O`
This reaction is reversible due to the hydrolysis of sodium metaborate `(NaBO_(2))`.
In the presence of complexing agents such as `cis-1,2-diol`, catechol, glycerol, etc. a complex is formed, and it prevents hydrolysis from taking the reaction in the forward direction.
.
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