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Homologous Series

Define Homolo...

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Define Homologous series

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Solution

It is defined as the series of similarly constituted compounds in which the members possess same functional group and has similar chemical characteristics and the two consecutive members differ in their molecular formula by -CH₂ group.

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Q. Define homologous series.

C_{3} H_{6}, C_{4} H_{8}

C_{5} H_{10}

belong to the same homologous series. Define homologous series.

define the following terms
A) catenation
b) homologous series of hydrocarbons
c) saponification
d) hydrogenation

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.

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.

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