Question

Write the molecular formula of 2nd and 3rd member of homologous series whose first member is ethyne.​

Answer 1

The general formula of homologous series whose first member is ethyne is

CnH2n-2,

Then two consecutive number of 2nd and 3rd member of homologous series

CH3-CH ( Propyene) n is 3

CH3CH2C- CH (2-Brutyne) n is 4

Hence the molecular formula is

C3H4 and C4H6