Compounds that tend to donate electron pairs are known as Lewis acid or nucleophiles. Which one of the following is not a Lewis acid?
Correct answer: C. AlCl3
- A. CH3-NH2
- B. PH3
- C. AlCl3
- D. H2O
Explanation
A Lewis base is a substance that can donate an electron pair. Option C, AlCl3, is the correct answer as it acts as a Lewis acid due to its ability to accept electron pairs to complete its octet. In contrast, CH3-NH2, PH3, and H2O all have lone pairs of electrons that can be donated, classifying them as Lewis bases.
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About Acids, Bases and Salts
Acid and base behaviour is explained through the Bronsted-Lowry transfer of protons and the Lewis donation or acceptance of electron pairs. The topic includes pH, pOH, ionisation and water equilibrium, plus salt formation and hydrolysis, where a salt solution may become acidic, basic or neutral.
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