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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

  1. AAddition of cis 1, 2 diol
  2. BAddition of borax
  3. CAddition of trans 1, 2 diol
  4. 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

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