Multiple Choice
Which of the following is the best base to use in an E2 reaction?
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8. Elimination Reactions
Solvents
2:40 minutesProblem 10c,d
Textbook Question
Indicate whether each of the following solvents is protic or aprotic:
c. acetic acid
d. hexane
Verified step by step guidance1
Step 1: Understand the difference between protic and aprotic solvents. Protic solvents have hydrogen atoms bound to electronegative atoms (like oxygen or nitrogen) that can participate in hydrogen bonding. Aprotic solvents lack such hydrogen atoms and cannot form hydrogen bonds.
Step 2: Analyze acetic acid (CH₃COOH). Acetic acid contains a hydroxyl (-OH) group attached to a carbonyl group. The hydrogen in the hydroxyl group is bound to oxygen, an electronegative atom, making acetic acid a protic solvent.
Step 3: Analyze hexane (C₆H₁₄). Hexane is a hydrocarbon composed entirely of carbon and hydrogen atoms. It does not contain any electronegative atoms like oxygen or nitrogen, nor does it have hydrogen atoms capable of forming hydrogen bonds. Therefore, hexane is an aprotic solvent.
Step 4: Summarize the findings: Acetic acid is a protic solvent because it has a hydroxyl group capable of hydrogen bonding. Hexane is an aprotic solvent because it lacks electronegative atoms and hydrogen bonding capability.
Step 5: Apply this understanding to other solvents in future problems by identifying functional groups and determining whether hydrogen bonding is possible.
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Video duration:
2mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Protic Solvents
Protic solvents are those that have a hydrogen atom attached to an electronegative atom, typically oxygen or nitrogen, allowing them to form hydrogen bonds. This characteristic enables protic solvents to donate protons (H+) in chemical reactions, which is crucial in many organic reactions, particularly those involving nucleophiles and electrophiles.
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Aprotic Solvents
Aprotic solvents lack hydrogen atoms bonded to electronegative atoms, meaning they cannot donate protons. These solvents can still solvate ions and molecules but do not participate in hydrogen bonding. Aprotic solvents are often used in reactions where strong nucleophiles are required, as they do not hinder nucleophilic attack.
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Solvent Properties in Organic Chemistry
The choice of solvent in organic chemistry significantly affects reaction mechanisms and outcomes. Protic and aprotic solvents influence the solubility of reactants, the stability of intermediates, and the overall reaction rate. Understanding the properties of solvents helps chemists select the appropriate medium for specific reactions, optimizing yields and selectivity.
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