Which amongst the following is not a characteristic of the homologous series?

The members of a homologous series can be represented by a general formula.

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Successive members of a homologous series differ by a

{CH}_{3}

group.

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The members of a homologous series show a similarity in chemical properties.

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The physical properties in the series of compounds have a regular gradation.

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Solution

The correct option is B Successive members of a homologous series differ by a ${CH}_{3}$ group.
The characteristics of homologous series are:

(1) The members can be represented by the same general formula. For example, $C_{n} H_{2 n}$ for alkenes.
(2) Successive member differs by a ${CH}_{2}$ group and not by a ${CH}_{3}$ group.

(3) Members show similarity in chemical properties.

(4) There is a regular gradation in physical properties. For example, in alkanes as 'n' value increases, their boiling point increases.

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Similar questions

(a) Give the general name of the class of compounds having the general formula $C_{n} H_{2 n - 2} .$ Write the name of the first member of this homologous series.
(b) The general formula of a homologous series of carbon compounds is $C_{n} H_{2 n} .$ 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 $C_{n} H_{2 n + 2}$

Q. What is meant by homologous series of organic compounds? Write the chemical formulae of two members of a homologous series and state which part determines the (i) physical properties, (ii) chemical properties, of these compunds.

Members of a homologous series have identical chemical properties.

why homologous series of carbon compounds are so called? Write two chemical formula of two consecutive members of a homologous series and state the part of these compounds that determine their (a) physical properties and (b)chemical properties.

Q. (c) Succeeding members of a homologous series differ by. (CH,CH2,CH3)

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