Which one of the following does not exist in the free form?

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 D $B H_{3}$
Due to back bonding $N F_{3}, B C l_{3}$ and $B B r_{3}$ exist in free form. Boron form different hydride of general formula $B_{n} H_{n + 4}$ and $B_{n} H_{n + 6}$ but $B H_{3}$ is unknown.

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

B C l_{3}

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B C l_{3}

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{B H}_{3}

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

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