(a) Define a homologous series. Give the name and structural formula of one homologue of the following:
CH₃OH
(b) Write the molecular formula of the third member of the homologous series of carbon compounds with general formula C_nHO₂_n₊₁OH.
(c) Name any two fossil fuels.

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Solution

(a) Homologous series: A series of organic compounds having similar structures and chemical properties and in which the successive compounds differ by -CH₂ group is called a homologous series. A homologue of CH₃OH will differ by the -CH₂group; therefore, methanol's successive homologue will be ethanol (C₂H₅OH).
The structural formula of ethanol is as follows:

(b) The molecular formula of the third member of the homologous series, comprising the general formula C_nH_2n₊₁OH, is C₃H₇OH (propanol).

(c) Coal and petroleum are the two fossil fuels.

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Similar questions

Q. (a) Define a homologous series. Give the name and structural formula of one homologue of the following:
CH₃OH
(b) Write the molecular formula of the third member of the homologous series of carbon compounds with general formula C_nH₂_n₊₁OH.
(c) Name any two fossil fuels.

Q. (a) Give the general name of the class of compounds having the general formula C_nH_2n₋₂. Write name of the first member of this homologous series.
(b) The general formula of a homologous series of carbon compounds if C_nH_2n. Write the molecular formulae of the second and fourth members of the series.
(c) Write the molecular formulae of the third and fifth members of homologous series of carbon compounds represented by the general formula C_nH_2n₊₂

C_{n} H_{2 n + 2}

is the general formula of a homologous series of hydrocarbons.
i) Is this series saturated or unsaturated?
ii) Name the series described above. Give the formula and name of the member with two carbon atoms.
iii) Draw the structural formula of the first member of this series.
iv) Define the homologous series and find the common difference between the successive members of this family.
v) Write the formula of n-butane and n-pentane.

(a) Give the names and structural formulae of the next two higher homologues of methane.
(b) The molecular formula of a hydrocarbon is $C_{10} H_{18} .$ Name its homologous series.
(c) Select the hydrocarbons which are members of the same homologous series. Give the name of each series.
$C_{5} H_{10}; C_{3} H_{8}; C_{6} H_{10}; C_{4} H_{10}; C_{7} H_{12}; C_{8} H_{16}$

Write the name and formula of the 2nd member of homologous series having general formula C_nH_2n.

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(a) Define a homologous series. Give the name and structural formula of one homologue of the following: CH3OH (b) Write the molecular formula of the third member of the homologous series of carbon compounds with general formula CnHO2n+1OH. (c) Name any two fossil fuels.

(a) Define a homologous series. Give the name and structural formula of one homologue of the following:
CH₃OH
(b) Write the molecular formula of the third member of the homologous series of carbon compounds with general formula C_nHO₂_n₊₁OH.
(c) Name any two fossil fuels.