Define functional grp and homologous series

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Define functional grp and homologous series

Posted by Rizul Dulat 6 years, 10 months ago

CBSE > Class 11 > Chemistry

3 answers

Yogita Ingle 6 years, 10 months ago

Functional group: The first part, i.e. R denotes the carbon -hydrogen framework of the molecule while the second part i.e. G is called the functional group. A functional group may be defined as as atom or a group of atoms present in a molecule which largely determines its chemical properties.

Homologous series: A homologous series is defined as a family or group of structurally similar organic compounds all the members of which contain the same functional group, Show a gradation in physical and similarity in chemical properties and any two adjacent members of which differ by a -CH2 group. The individual members of such a series are called homologues and the phenomena is called homology.

Alkanes constitute a homologous series.

CH₄ Methane

C₂H₆ Ethane

C₃H₈ Propane

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Čůťê Ğīřł ? ? 6 years, 10 months ago

HOMOLOGOUS SERIES :: The series of carbon chain with same functional group having a difference of CH2 with every successive member . Lets take a simple example ... like .. we are having .... CH4 , C2H6 , C3H8 ... in CH4 there is one C atom and 4 H atoms but in its next member i.e. C2H6 ... there are 2 C atoms and 6 H atoms now ... look at their difference ... there is difference of CH2 in both of the members ... and the same is with C2H6 and C3H8 ... thus , it belongs to Homologous series. ?

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Čůťê Ğīřł ? ? 6 years, 10 months ago

FUNCTIONAL GROUP :: The elements or group of elements which determines the chemical properties of the respective compound are known to be functional group . For example : -OH , -COOH etc. ==> If OH group is attached with a compound then the first thought strike on our mind is that the compound is alcoholic ... means we can determine a lots of chemical properties just on the basis of this functional group .

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