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Q.

What is the structural formula of ethanol?

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Detailed Solution

Basic Ethanol Formulas

Formula TypeFormulaExplanation
Molecular FormulaC₂H₆OShows the total number of each type of atom in one molecule of ethanol
Chemical FormulaC₂H₅OHMost common way to write ethanol, showing the hydroxyl group (-OH)
Condensed Structural FormulaCH₃CH₂OHShows how atoms are connected in a simplified way
Empirical FormulaC₂H₆OSimplest whole number ratio of atoms (same as molecular formula for ethanol)

Structural Representations

Formula TypeRepresentationDescriptionUses
Expanded Structural FormulaH-C-C-O-H with all H atoms shownShows every atom and bond explicitlyUnderstanding molecular structure
Skeletal FormulaLine-angle structureShows carbon backbone as lines, OH group explicitAdvanced organic chemistry
3D FormulaTetrahedral arrangementShows three-dimensional shape of moleculePhysical chemistry studies

Ethanol Reaction Formulas

Reaction TypeFormulaExplanationApplication
Complete CombustionC₂H₅OH + 3O₂ → 2CO₂ + 3H₂OEthanol burns in oxygen to produce carbon dioxide and waterEnergy production, Class 10
Incomplete CombustionC₂H₅OH + 2O₂ → 2CO + 3H₂OInsufficient oxygen leads to carbon monoxide formationSafety studies
FermentationC₆H₁₂O₆ → 2C₂H₅OH + 2CO₂Glucose is converted to ethanol by yeastBiochemistry, Class 12
DehydrationC₂H₅OH → C₂H₄ + H₂OEthanol loses water to form ethene (requires catalyst)Organic synthesis

Oxidation Reactions of Ethanol

Oxidation LevelFormulaProductConditions
Primary OxidationC₂H₅OH + [O] → CH₃CHO + H₂OAcetaldehyde (ethanal)Mild oxidizing agent
Secondary OxidationCH₃CHO + [O] → CH₃COOHAcetic acid (ethanoic acid)Strong oxidizing agent
Complete OxidationC₂H₅OH + 2[O] → CH₃COOH + H₂ODirect conversion to acetic acidExcess oxidizing agent

Related Chemical Formulas

CompoundFormulaRelationship to EthanolImportance
Ethanoic Acid (Acetic Acid)CH₃COOHOxidation product of ethanolFood industry, Class 10
Ethanolic KOHKOH/C₂H₅OHPotassium hydroxide dissolved in ethanolOrganic chemistry reactions
Ethyl AcetateCH₃COOC₂H₅Ester formed from ethanol and acetic acidSolvent, esterification
Acetaldehyde (Ethanal)CH₃CHOFirst oxidation product of ethanolIntermediate in metabolism

Isomerism and Alternative Formulas

Isomer TypeFormulaNameDifference from Ethanol
Functional IsomerCH₃OCH₃Dimethyl etherDifferent functional group (ether vs alcohol)
Structural FormulaC₂H₆OSame molecular formulaBoth have same atoms, different arrangement

Important Physical and Chemical Properties

PropertyValue/FormulaSignificance
Molar Mass46.07 g/molCalculated from C₂H₆O
Density0.789 g/cm³Less dense than water
Boiling Point78.37°CDue to hydrogen bonding
Hydrogen BondingR-OH···H-ORExplains physical properties

Class-Specific Formula Applications

Class 10 

  • Basic Formula: C₂H₅OH
  • Combustion: C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O
  • Key Focus: Recognition and simple reactions

Class 11-12 

  • Structural formulas: CH₃CH₂OH, skeletal formulas
  • Mechanism reactions: SN1, SN2, elimination reactions
  • Advanced applications: Esterification, oxidation mechanisms
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