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Alcohols

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Topics

  • Definition: Alcohol
  • Key Points: Occurence of Ethanol
  • Key POints: Alcohol
CISCE: Class 10

Definition: Alcohol

Alcohols are the hydroxyl (-OH) derivatives of alkanes. They are formed by replacing one or more hydrogen atoms of the alkane with an OH group.

CISCE: Class 10

Key Points: Alcohols

  • Alcohols are hydroxyl (-OH) derivatives of alkanes, formed by replacing one or more hydrogen atoms with an -OH group.
  • Alcohols are classified as:
    - Monohydric (e.g., Methanol, Ethanol)
    - Dihydric (e.g., Ethylene glycol)
    - Trihydric (e.g., Glycerol)
  • Ethanol (C₂H₅OH) is produced by fermentation of sugar or by cracking petroleum (ethane source).
  • Ethanol is used in wines (spirit of wine) and is also known as grain alcohol.
  • Isomerism in alcohols occurs in compounds with three or more carbon atoms (e.g., propanol and butanol have isomers, but neither methanol nor ethanol does).
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