Chemistry - Complete Pblock- Question with Solution | TestHub

This reaction is reversible reaction because sodium metaborate, ${\mathrm{Na}}^{+}{\left[\mathrm{B}(\mathrm{OH}{)}_4\right]}^{-}$formed by the reaction between $\mathrm{B}(\mathrm{OH}{)}_3$ and $\mathrm{NaOH}$ gets hydrolysed to regenerate $\mathrm{B}(\mathrm{OH}{)}_3$ and $\mathrm{NaOH}$
If, some quantity of polyhydroxy compound like cis-1, 3-diol, catechol, glycerol etc. is added to the reaction mixture. The $\mathrm{B}(\mathrm{OH}{)}_3$ combines with such polyhydroxy compound to give chelated complex compound. Due to complex compound formation, stability increases and due to higher stability of complex, reaction moves in forward direction.