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JEE Main & Advanced Chemistry The p-block Elements-II / p-ब्लॉक तत्व-II Question Bank Self Evaluation Test - The p-Block Elements (Group 13 and Group 14)

  • question_answer
    \[B{{(OH)}_{3}}+NaOH\to NaB{{O}_{2}}+Na[B{{(OH)}_{4}}+{{H}_{2}}O\] How can this reaction is made to proceed in forward direction?

    A) addition of cis 1,2-diol

    B) addition of borax

    C) addition of trans 1,2-diol

    D) addition of \[N{{a}_{2}}HP{{O}_{4}}\]

    Correct Answer: A

    Solution :

    [a] \[{{H}_{3}}B{{O}_{3}}\] acts as weak monobasic Lewis acid. \[B{{\left( OH \right)}_{3}}+NaOH\to Na\left[ B{{\left( OH \right)}_{4}} \right]\] On addition of cis-1, 2-diol in \[{{H}_{3}}B{{O}_{3}}\] solution, acidic strength of \[{{H}_{3}}B{{O}_{3}}\] increases due to chelation effect.


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