What is a homologous series? Which two of the following organic compounds belong to the same homologous series?

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Solution

Homologous series is a series of compounds which have same functional group and same chemical properties and successive members of the series differ by one CH₂ group. For example, methane, ethane, propane, butane.

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Q. What is a homologous series? Which two of the following organic compounds belong to the same homologous series?

C_{2} H_{6}, C_{2} H_{6} O, C_{2} H_{6} O_{2}, C H_{4} O

(a) What is a homologous series? Explain with an example.
(b) State two characteristics of a homologous series.
(c) The molecular formula of an organic compound is C₁₈H₃₆. Name its homologous series.
(d) Select the hydrocarbons which belong to the same homologous series. Give the name of each series.
CH₄, C₂H₂, C₂H₄, C₂H₆, C₄H₁₀, C₃H₄, C₃H₆
(e) What is meant by 'heteroatom'? Give examples. Write the names and formulae of two organic compounds containing different heteroatoms.

Q. Which of the following is not true for compounds belonging to same homologous series?

Q. Identify the homologous series among the following:
1.

H C O O H

C H_{3} C O O H

C_{2} H_{6}

C_{2} H_{5} C O O H

5. Propanone

Q. Choose the pairs of compounds belonging to same homologous series.

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What is a homologous series? Which two of the following organic compounds belong to the same homologous series?

Homologous series is a series of compounds which have same functional group and same chemical properties and successive members of the series differ by one CH2 group. For example, methane, ethane, propane, butane.

Homologous series is a series of compounds which have same functional group and same chemical properties and successive members of the series differ by one CH₂ group. For example, methane, ethane, propane, butane.