Which of the following compounds does not undergo hydrolysis completely?

B F_{3}

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B C l_{3}

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B B r_{3}

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Solution

The correct option is A $B F_{3}$
$B F_{3}$ does not undergo hydrolysis completely due to strong B-F bond.
Instead, it forms an addition product.
$B F_{3} + H_{2} O ⇌ H^{+} [B F_{3} O H]^{-} H_{2} O - - \to H_{3} O^{+} [B F_{3} O H^{-}]$

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Similar questions

$B C l_{3}, B B r_{3} a n d B I_{3}$ undergo rapid and complete hydrolysis but the fluoride are not completely hydrolysed due to formation of –

The correct order of Lewis acidity of $B X_{3}$ molecule is

B F_{3}, B C l_{3}, B B r_{3}, B I_{3}

B F_{3} < B C l_{3} < B B r_{3} < B I_{3}

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