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Identify alcohols and their key reactions

Organic chemistry • Reactions of alkenes and alcohols

Key concepts

What you'll likely be quizzed about

  • An alcohol contains an –OH (hydroxyl) group bonded to a saturated carbon atom.
  • The hydroxyl group plays a significant role in determining properties by facilitating hydrogen bonding and acting as a reactive site for substitution or oxidation.
  • Naming includes the suffix "-ol"; for instance, methanol is represented as CH3OH and ethanol as C2H5OH.
  • The general molecular formula for alcohols is CnH2n+1OH, where n is the number of carbon atoms.

Flashcards

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What are common uses for propanol and butanol?

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Propanol and butanol serve as solvents, synthesis intermediates, and potential biofuels.

Key notes

Important points to keep in mind

Alcohols feature an –OH group on a saturated carbon; names end in "-ol."

General formula is CnH2n+1OH; naming follows carbon count from methanol to butanol.

Methanol and ethanol are fully miscible with water; solubility decreases with chain length.

Complete combustion yields CO2 and H2O; incomplete combustion produces CO or soot.

Sodium reacts with an alcohol to produce an alkoxide and hydrogen gas indicated by bubbling.

Primary alcohols oxidize to aldehydes and carboxylic acids; secondary to ketones; tertiary resist oxidation.

Acidified potassium dichromate serves as an oxidizing agent, changing from orange to green on reduction.

Position numbers (e.g. propan-1-ol vs propan-2-ol) designate the carbon carrying the –OH group.

Reaction observations (flame color, gas evolution, color change of oxidant) provide evidence of reactions.

Energy release during combustion justifies the use of alcohols as fuels with longer chains yielding more energy.

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