# Write the molecular formulae of the thired and fifth memebers of homologous eries of carbon compounds represented by the general formula C_(n)H_(2n-2

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Write the molecular formulae of the thired and fifth memebers of homologous eries of carbon compounds represented by the general formula C_(n)H_(2n-2).

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The general formula C_(n)H_(2n-2) is of the alkyne series . We know that the first member of the alkyne series is ethyne (C_(2)H_(2)) and it has 2 carbon atoms in its molecule.
(i) Since the first member of alkyne series has 2 carbon atopmes in the therefore, third member of alyne series will have 4 carbn atoms in its molecule . Soif wer put n=4 in the general formula C_(n)H_(2n-2) then the molecular formula of the fifth memeber of the alkyne series will be c_(6)H_(2)xx6-2 "or" C_(6)H_(10)`.