Answer: Accepts an electron pair.
- A Accepts an electron pair
- B Donates an electron pair
- C Donates a proton only
- D Accepts a proton only
Correct answer: A. Accepts an electron pair
Explanation: A Lewis acid is an electron-pair acceptor; a Lewis base is an electron-pair donor.
As the reaction proceeds, reactant concentration falls and product concentration rises until both level off at equilibrium.
Concept context
When forward and reverse reaction rates are equal, equilibrium is reached. Learn about Kc, Kp, Le Chatelier's principle, and acid-base equilibria, including pH, buffer solutions, and solubility product.