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State Any Four Characteristics of a Homologous Series - Science and Technology 2

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State any four characteristics of a homologous series

State two characteristics of a homologous series.

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Solution

Characteristics of a homologous series:

  • Each member of the series differs from the preceding one by the addition of a -CH2 group and by 14 a.m.u.
  • All members of a homologous series share the general formula.
    Example: The general formula for alkane is CnH2n+2 and alkene is CnH2n.
  • The physical properties of the members show a gradation in properties as the molecular mass increases.
  • The chemical properties also show a gradient similarity.
    Example: Methane and ethane react with chlorine to form methyl chloride and ethyl chloride, respectively.
    CH4 + Cl2 → CH3Cl
    C2H6 + Cl2 → C2H5Cl
  • All members of a homologous series can be prepared by the same general method of preparation.
    Example: Alcohols can be prepared from alkyl halides.

          `CH_3Br+KOH " Boil"/""CH_3OH+KBr`

          `C_2H_5Br+KOH " Boil"/""C_2H_5OH+KBr`

            

 

Concept: Homologous Series of Carbon Compound
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APPEARS IN

Lakhmir Singh Class 10 Chemistry (Science)
Chapter 4 Carbon And Its Compounds
Q 38.2 | Page 241
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