Question

write the molecular formula and the names of immediate lower and higher homologous of C3H6

Answer 1

Thanks for asking the question.
The higher homologue of propane is butane. Propane contains three carbon atoms and butane has four carbon atoms so its formula is C4H10. There is an addition of CH2 group in successive homologues of a homologous series. With the increase in the number of CH2 groups, the physical properties such has melting point, boiling point, physical state etc. also change.
Hope it helps.

Answer 2

Hi mate here is ur query....

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At first know what is homologous series??

Homologous series is a series of compounds with similar chemical properties and same functional group differing with the successive member by CH2. 

Now chemical formula of C3H6 (propene)

Hence lower and higher homologous series of C3H6

now homologous series
C4H8(Butene) &
C2H4(Ethene)

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Hope this will help you