Which of the following is least stable?

B F_{3}

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B C l_{3}

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B B r_{3}

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B H_{3}

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Solution

The correct option is A $B H_{3}$
As the $B H_{3}$ is electron deficient molecule it is unstable and forms dimer called diborane( $B_{2} H_{6}$ ). even though the remaining $B F_{3}, B C l_{3}, B B r_{3}$ are also electron deficient but because of the large size of the florine,chlorine and bromine atoms these can not form dimers as borane.
Hence option D is correct.

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Similar questions

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}

{B l}_{3} < {B B r}_{3} < {B F}_{3} < {B C l}_{3}

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