If the third member of a homologous series is C₃H₈, the fifth member will be

Ruonaxavier

1 year ago

These are alkanes
And alkanes are represented by CnH2n+2
So if the third member of the homologous series is 3
C3H8
The fifth member will be C5H2×5+2
C5H10+2=C5H12

johnlord6

5 years ago

that is pentane for those who did not know

Chibuikegerald60

10 years ago

Correct

Bobnati

10 years ago

Here is an explanation:

A homologous differs by a CH2 group..so if it the third member is C3H8 then the fourth will be C3H8 + CH2 = C4H10 and the fifth will be C4H10 + CH2 = C5H12 which is the answer

REF: Check: Essential Chemistry, Hydrocarbons topic.