Alcohols and Carboxylic Acids

Alcohols and Carboxylic Acids

Introduction to Alcohols

  • Alcohols are organic compounds with a hydroxyl (-OH) group attached to a carbon atom.
  • The general formula for alcohols is CnH2n+1OH.
  • Alcohols can be divided into three classes: primary, secondary, and tertiary depending on the number of carbon atoms connected to the carbon atom that carries the hydroxyl group.
  • Alcohols are soluble in water as they form hydrogen bonds with water molecules.
  • They can act as weak acids due to their ability to donate a proton (H+) from the hydroxyl group.

Physical Properties of Alcohols

  • Alcohols have higher boiling points than equivalent alkanes and alkenes due to hydrogen bonding.
  • Small alcohols are completely soluble in water but solubility decreases as chain length increases.

Chemical Reactions of Alcohols

  • Alcohols can undergo several types of reactions, including combustion, oxidation, and substitution.
  • Primary alcohols can be oxidized to form aldehydes and further oxidized to carboxylic acids.
  • Secondary alcohols can be oxidized to ketones, but tertiary alcohols cannot be oxidized.
  • Alcohols can react with carboxylic acids in the presence of a catalyst to form esters in a process known as esterification.

Introduction to Carboxylic Acids

  • Carboxylic acids are organic compounds that contain a carboxyl group (-COOH).
  • The general formula for carboxylic acids is CnH2n+1COOH.
  • Carboxylic acids can be formed by the oxidation of alcohols and aldehydes.
  • They are named by replacing the -e in the corresponding alkane with -oic acid.

Physical Properties of Carboxylic Acids

  • Like alcohols, carboxylic acids also form hydrogen bonds, leading to relatively high boiling points.
  • They are polar molecules and are soluble in water. However, as with alcohols, solubility decreases as chain length increases.

Chemical Reactions of Carboxylic Acids

  • Carboxylic acids can react with alcohols to form esters.
  • They can also react with bases to form salts.
  • Carboxylic acids can undergo decarboxylation, which is a reaction resulting in the loss of carbon dioxide.
  • In the presence of heat, carboxylic acids can also perform dehydration reactions to form anhydrides.