Question

Write the molecular formula of the 2

nd and the 3

rd member of the

homologous series whose first member is methane

Answer 1

C2H6 C3H8 are correct

Answer 2

The first member is methane and the second member's hydrogen atoms' no.increases by the factor 2n+2For 1 carbon atom in methane, the no.of hydrogen atom is 4 Similarly for the second molecule which has 2 C atoms will have 6 hydrogen atomsThis molecule is called ethane and the next one in the homologous series ,i.e, C3H8 is propane.