Among trihalides of boron, how many is/are in gaseous state at room temperature (25°C)?
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BF3, BCl3, and BBr3
Boron tribromide (BBr3) is a colorless, flammable liquid that can be used to demethylate or dealkylate.
Boron trichloride (BCl3) is a colorless, explosively reactive gas that is used in chemical synthesis.
Boron trifluoride (BF3) is a noxious, colorless, corrosive gas that produces white vapors when exposed to moisture.
Because there is no back bonding between the empty orbital of B and the occupied p-orbital of I in BI3, it is the strongest Lewis acid, whereas BF3 has the strongest back bonding, making it the weakest acid.
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