Chemical Reactions of Alcohols: Cleavage of O-H bond
Reactions where the O-H bond breaks, including the acidic nature of alcohols, esterification, and reaction with active metals.
What is Chemical Reactions of Alcohols: Cleavage of O-H bond?
An anion of the form R-O-, derived from an alcohol by the loss of a proton from the hydroxyl group.
Key formula / rule: Reaction of Alcohol with Active Metal
Key points
- Understand the acidic nature of alcohols.
- Explain the reaction of alcohols with active metals.
- Describe the mechanism and conditions for esterification.
- Compare the relative acidity of different types of alcohols.
Common exam trap
Confusing O-H bond cleavage with C-O bond cleavage reactions.
Definitions
- Term
Alkoxide
- Meaning
An anion of the form R-O-, derived from an alcohol by the loss of a proton from the hydroxyl group.
- Term
Esterification
- Meaning
A chemical reaction in which an ester is formed from an alcohol and an acid (typically a carboxylic acid).
Learning objectives
Understand the acidic nature of alcohols.
Explain the reaction of alcohols with active metals.
Describe the mechanism and conditions for esterification.
Compare the relative acidity of different types of alcohols.
Formulae
- Name
Reaction of Alcohol with Active Metal
- Note
Forms sodium alkoxide and hydrogen gas.
- Expression
2R-OH + 2Na → 2R-O-Na+ + H2↑
- Name
Esterification
- Note
Acid-catalyzed reaction forming an ester and water.
- Expression
R-OH + R'-COOH ⇌ R'-COOR + H2O
Prerequisites
Structure and nomenclature of alcohols
Bond polarity and electronegativity
Acids and bases
Reaction mechanisms (nucleophilic attack)
Common mistakes
Confusing O-H bond cleavage with C-O bond cleavage reactions.
Underestimating the acidic nature of alcohols; they are not completely neutral.
Forgetting the role of acid catalysts in esterification.
Incorrectly predicting the order of acidity for different types of alcohols.
Keywords
Alcohol reactions
O-H bond cleavage
Acidity of alcohols
Alkoxide
Esterification
Active metals
Nucleophilic attack
Inductive effect
Practice preview
In the Fischer esterification of acetic acid with ethanol, what is the role of the acid catalyst (e.g., concentrated H₂SO₄)?…
medium
The reaction of an alcohol with a carboxylic acid to form an ester and water is known as:…
easy
The reaction of alcohols with active metals like sodium involves the cleavage of the O-H bond. Which of the following factors influences the rate of this reaction?…
hard