Boron halides behave as Lewis acids because of their ________ nature.

proton donor

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covalent

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electron deficient

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ionising

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Solution

The correct option is B electron deficient
According to Lewis, the compound which can accept a lone pair of electron, are called acids.
Boron halides, being electron deficient compounds, can accept a lone pair of electrons, so termed as Lewis acid.

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Why does boron trifluoride behave as a Lewis acid?

The Lewis acid character of halides of boron are as follows:

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