Lewis acid character of boron tri halides follows order:

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p-Block Elements - I

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The Lewis acid character of boron tri halides follows the order:

$BBr _3 > BI _3 > BCI _3 > BF _3$

$BCl _3 > BF _3 > BBr _3 > BI _3$

$BF _3 > BCl _3 > BBr _3 > BI _3$

$BI _3 > BBr _3 > BCl _3 > BF _3$

(JEE MAIN-2023)

Solution

Extent of back bonding, reduces down the group leading to more Lewis acidic strength $BF _3 > BCl _3 > BBr _3 > BI _3$ (extent of back bonding) $(2 p-2 p)(2 p-3 p)(2 p-4 p)(2 p-5 p)$

$BF _3 < BCl _3 < BBr _3 < BI _3$ (lewis acidic nature)

Standard 11

Chemistry

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The Lewis acid character of boron tri halides follows the order:

Solution

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$H_3BO_3$ $\xrightarrow{{{T_1}}}X\xrightarrow{{{T_2}}}Y\xrightarrow{{red\,hot}}$ $B_2O_3$ if $T_1 < T_2$ then $X$ and $Y$ respectively are

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$H_3BO_3$ $\xrightarrow{{{T_1}}}X\xrightarrow{{{T_2}}}Y\xrightarrow{{red\,hot}}$ $B_2O_3$

if $T_1 < T_2$ then $X$ and $Y$ respectively are