p-Block Elements-I - Result Question 8

####8. B(OH)3+NaOHNaBO2+Na[B(OH)4]+H2O

How can this reaction is made to proceed in forward direction?

(2006, 3M)

(a) Addition of cis 1, 2-diol

(b) Addition of borax

(c) Addition of trans 1, 2-diol

(d) Addition of Na2HPO4

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Answer:

Correct Answer: 8. (a)

Solution:

  1. Orthoboric acid is a very weak acid, direct neutralisation does not complete. However, addition of cis-diol allow the reaction to go to completion by forming a stable complex with [B(OH)4]as:

H2COH2CO>BOCH2+2H2OHO>BOOH+2HCH2OHCH2OH



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