Question

Define homologous series of a compound. Write the name and formula
of next homologue of
(i) C3H8
(ii) CH3OH.​

Answer 1

Homologous series of a compound is a series of organic compounds which have same structures and chemical properties and each successive compounds will differ by one -CH₂ group.

(i) C₃H₈

Next homologue of C₃H₈ is = C₃H₈ + CH₂ = C₄H₁₀

Name of next homologue is Butane.

(ii) CH₃OH

Next homologue of CH₃OH is = CH₃OH + CH₂ = CH₃CH₂OH

Name of next homologue is Ethanol.

Answer 2

The name and formula of next homologue of $C_4H_1_0$ Butane and  $C_2H_5OH$Ethanol.

Explanation:

• Homologous Series can be defined as the group of elements which possess the same 'structural and chemical properties'.

• In homologous series the successive compound differ by $CH_2$ group.

• These homologous series are different depending upon the functional group attached to them like alcohol Homologous series, Aldehyde homologous series and many other.

• $C_3H_8$  belongs to the homologous series of alkane so the next alkane will be $C_4H_1_0$.

• The next homologus series of $C_3H_8$  will be $C_3H_8 + CH_2 = C_4H_1_0.$.

• $CH_3OH$ belongs to the homologous series of alcohol so the next member will be $CH_2CH_2OH$ or $C_2H_5OH$.

           $CH_3OH + CH_2 = C_2H_5OH.$

Learn more about homologous series

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