General Science • ChemistryMedium
Which of the following chemical species acts as a Lewis acid according to the electronic theory of acids and bases?
A. Ammonia molecule
B. Boron trifluoride molecule✓ Correct Answer
C. Hydroxide ion
D. Water molecule
💡 Solution & Explanation
According to the Lewis theory, an acid is defined as an electron pair acceptor, whereas a base is an electron pair donor. Boron trifluoride possesses an incomplete octet of eight electrons around the central boron atom, allowing it to accept an electron pair and act as a Lewis acid. Ammonia, water, and hydroxide ions possess lone pairs of electrons and function as Lewis bases. Coordinate covalent bonds are formed during Lewis acid-base adduct formation.
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