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Chad gives a comprehensive lesson on how to rank acids and bases. This is presented in the context of the ARIO mnemonic which stands for Atom, Resonance, Induction, and Orbitals which helps students remember the most important factors affecting acidity and basicity in the most common order of importance. The Atom Rule for ranking acids and bases shows how the size and electronegativity of the basic atom affect its strength as a base. Of second importance is the effect of resonance on acidity and basicity as resonance can stabilize a base resulting in a weaker base. Typically of third importance is the effect of induction on acidity and basicity. Electron-withdrawing groups such as electronegative atoms near the atom acting as a base will help stabilize it resulting in a weaker base. Finally, the Orbital Rule describes the role that the hybridization of the atom acting as a base affects its basicity. Generally and all else being equal the order of stability with regard to hybridization is sp / sp2 / sp3 and the order of base strength is the opposite: sp3 / sp2 / sp. Chad provides numerous examples of how to rank acids and bases to demonstrate how each rule is applied and concludes the lesson with several additional examples of ranking acids. If you want all my study guides, quizzes, and practice exams, check out my premium course at https://www.chadsprep.com/organic-chemistry-youtube 00:00 Lesson Introduction 00:33 Ranking Acids and Bases (ARIO mnemonic) 03:31 The Effect of Charge on Acidity and Basicity of Organic Compounds 06:10 The Atom Rule for Ranking Acids and Bases of Organic Compounds 12:27 How Resonance Affects Acidity and Basicity of Organic Compounds 16:20 How Induction Affects Acidity and Basicity of Organic Compounds 25:12 How Hybridization Affects Acidity and Basicity of Organic Compounds 29:09 Examples of Ranking Acids https://www.chadsprep.com/ #organicchemistry #organicchemistrytutorial #acidsandbases
Answer each question based on the video lesson you just watched. All answers can be found in the video — no outside knowledge is required.
Apply the ARIO mnemonic (Atom, Resonance, Induction, Orbitals) to rank bases and acids. Show all reasoning for each problem; problems increase in difficulty.
These are challenging, exam-level questions that require you to apply the ARIO framework (Atom, Resonance, Induction, Orbitals) across multi-step scenarios, analyze competing effects, and evaluate real organic structures. Work through each carefully — some questions extend beyond the video into related organic chemistry concepts.
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