Advertisements
Advertisements
प्रश्न
State any four characteristics of a homologous series
State two characteristics of a homologous series.
Advertisements
उत्तर
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`
APPEARS IN
संबंधित प्रश्न
Write the next homologue of the following: C4H6
Write the molecular formula of first two members of homologous series having functional group -Cl.
Write the molecular formula of first two members of homologous series having functional group – OH
What is the next higher homologue of methanol (CH3OH)?
Give the molecular formula of one homologue of each of the following:
C2H6
Write the names and formulae for the first three members of the homologous series for chloroalkanes.
What is a homologous series? Explain with an example.
The molecular formula of an organic compound is C18H36. Name its homologous series.
The number of carbon atoms present in the molecule of fifth member of the homologous series of alkynes is:
(a) four
(b) five
(c) six
(d) seven
Give the abbreviated formula of the third member of the alcohol.
What is the difference in the molecular formula of any two adjacent homologues in terms of molecular mass?
What is the difference in the molecular formula of any two adjacent homologues:
(i) In terms of molecular mass
(ii) In terms of number and kind of atoms per molecule?
There are different general molecular formula for all members of the homologous series.
Observe the structural formula and answer the following questions.
- Write the name of the given hydrocarbon.
- The given hydrocarbon is included in which type of hydrocarbon?
- What is the kind of compounds with the above characteristic structure called?
C3H8 belongs to the homologous series of ______.
The first member of alkyne homologous series is
Name the third homologue of alcohols.
Name the following:
Group of organic compounds where the successive members follow a regular structural pattern, successive compounds differ by a 'CH2' group.
