Question

properties of trihalides​

Answer 1

Explanation:

The trihalides form planar trigonal structures and are Lewis acids because they readily form adducts with electron-pair donors, which are called Lewis bases. For example, fluoride (F–) and boron trifluoride (BF3) combine to give the tetrafluoroborate anion, BF4–.

Answer 2

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• Boron trichloride (BCl3) is a colorless, dangerously reactive gas that is a valuable reagent in organic synthesis. Boron trifluoride (BF3) is a pungent, colorless, corrosive, toxic gas that forms white fumes in moist air.