Which of the following molecule/ion has higher $B - O$ bond length ?

H_{3} B O_{3}

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[B (O H)_{4}]^{-}

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Both (a) and (b) have equal

B - O

bond length

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None of these

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Solution

The correct option is C $[B (O H)_{4}]^{-}$
In $[B (O H)_{4}]^{-}$ the $B - O$ bond length is higher to minimize the repulsion between bond pairs of electrons.

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