(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. Lakhmir Singh Chemistry Class 10

(a) What is a homologous series ? Explain with an example. (b) State

1.	(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. Lakhmir Singh Chemistry Class 10
Answer» tion:a)a homologous series is a series of compounds with the same FUNCTIONAL group and similar CHEMICAL properties.b)similar chemical properties they differ by CH2 GRADUAL increase in PHYSICAL properties they have same general formulac)alkenesd)alcohols CH3OH , C2H5OH , C3H8OH , C4H10.OH General formula=C(n)H(2n+1)OHe)atoms other than carbon and hydrogen in organic compounds which decide chemical properties of that compound Ex Nitrogen Oxygen Sulphur Halogens etcEx C3H7(Cl). CH3(O)H H H H \| \| \| C-C-C-Cl \| \| \| H H H