JEE Advanced2006Chemistryp Block Elements (Group 13 & 14)Actual
B ( OH )₃+ NaOH NaBO ₂+ Na [ B ( OH )₄ ]+ H ₂ O . How can this reaction is made to proceed in forward direction?
Options
- AAddition of cis 1, 2 diol
- BAddition of borax
- CAddition of trans 1, 2 diol
- DAddition of Na ₂ HPO ₄
Correct answer
A. Addition of cis 1, 2 diol
Step-by-step solution
This reaction is reversible reaction because sodium metaborate, Na ⁺ [ B ( OH )₄ ]⁻ formed by the reaction between B ( OH )₃ and NaOH gets hydrolysed to regenerate B ( OH )₃ and NaOH If, some quantity of polyhydroxy compound like cis-1, 3-diol, catechol, glycerol etc. is added to the reaction mixture. The B ( 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 directi