Give the IUPAC name for:

Write the structural formula of the two isomers of butane.

Give the :

(i) IUPAC name of the homologous series.

(ii) Characteristic bond type.

(iii) IUPAC name of the first member of the series - in each case i.e., (a) and (b) relating to the homologous series of hydrocarbons - whose general formula is (a) C_nH_2n-2 (b) C_nH_2n+2