P block



  • 0_1546767050165_IMG_20190106_145957.jpg
    Ans=(b)
    But..
    0_1546767233659_IMG_20190106_150332.jpg
    Pls explain



  • @sri B(OH)3 is Lewis acid not a protic acid. It accepts l.p from water but doesn't give H+.



  • @sri
    B(OH)3 is Lewis acid not a protic acid. It accepts lone pairs from water but doesn't give H+.
    On the basis of general principles, it is certainly possible to imagine that such a mechanism might be at play. If one considers the structure of boric acid, it should be readily apparent that the boron atom could be quite electrophilic and hence act as a Lewis acid: it possesses a formally vacant p-orbital; it is bound to highly electronegative oxygen atoms, which withdraw electron density and create a partial positive (δ+) charge on it (though this effect may be mitigated by the oxygen lone pairs, which can donate electron density into the aforementioned p-orbital); and finally, it has a planar geometry that makes it quite sterically accessible to approaching nucleophiles. Such a mechanism is also lent plausibility by the well-known propensity of various other boron compounds for forming Lewis adducts and being highly susceptible to hydrolysis (where applicable).



  • @srinidhi-v so the ans should not be (b) as in b it is written that it gives H+...Pls explain...If not then what should be the correct option



  • @sri According to me no option is completely correct. In b option only half statement is correct.So option B will be the best choice.


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