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.

Open in App

Solution

A series of organic compounds with the same general formula but differ from adjacent members by " $- C H_{2} -$ " group are referred to as homologous series of compounds.

Members of the homologous series of functional group aldehyde are:
1. Ethanal : $C H_{3} C H O$
2. Propanal : $C H_{3} C H_{2} C H O$

Physical properties: Determined by the hydrocarbon chain $- C H_{3}$ and $- C_{2} H_{5}$ .
Chemical properties: Determine by the functional group $- C H O .$

Suggest Corrections

Similar questions

Q. Why homologous series of carbon compounds are so called? Write chemical formula of two consecutive members of a homologous series and state the part of these compounds that determines their (i) physical properties, and (ii) chemical properties?

Q. What are homologous series of carbon compounds? Write the molecular formula of two consecutive members of homologous series of aldehydes. State which part of these compounds determines their (i) physical and (ii) chemical properties.

Q. Compounds having the same general formula & similar chemical properties are part of homologous series.

(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. A homologous series is a family of hydrocarbons with different chemical properties that share the same general formula.

Join BYJU'S Learning Program