Question

What is homologous sires .? Explain with an example

Answer 1

H3C-CH2-CH3     Propane

H3C-CH2-Ch2-CH3    Butane

H3C-Ch2-CH2-Ch2-CH3    Pentane

H3C-Ch2-CH2-Ch2-Ch2-CH3   Hexane

In organic chemistry, a homologous series is a series of compounds with the same functional group and similar chemical properties in which the members of the series differ by the number of repeating units they contain.[1] This can be the length of a carbon chain,[1] for example in the straight-chained alkanes (paraffins), or it could be the number of monomers in a homopolymer such as amylose.

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Answer 2

Answer:

• A homologous series is a series of compounds, which has the same functional group.
• This also contains similar general formula and chemical properties. Since there is a change in the physical properties, we can say that there would be an increase in the molecular size and mass.

Examples:-

Methane, ethane, propane, butane, etc. are all part of the alkane homologous series.

The general formula of this series is CnH2n+2.

• Methane CH4
• Ethane CH3CH3
• Propane CH3CH2CH3
• Butane CH3CH2CH2CH3.

It can be noticed that there is a difference of −CH2 unit between each successive compound.