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Which one of the following molecule is more stable?

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$BBr_3$ is strongest lewis acid among $BF_3,BCl_3,BBr_3$.
$(CH_3)_3NBBr_3$ is more stable,due to $\pi$-back bond ,$(CH_3)_3NBF_3$ is less stable.
Hence (c) is the correct answer.
answered Mar 10, 2014 by sreemathi.v

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