Question

The molecular formulae of two members of a homologous series are C3H4 and C6H10. Write the molecular formula of the member with five carbon atoms in a molecule.

Answer 1

Answer:

molecular formula of the member with five carbon atoms is C5H8

Answer 2

Alkynes

Pentyne - C5H8

Explanation:

Given: The molecular formulae of two members of a homologous series are C3H4 and C6H10.

Find: Molecular formula of the member with five carbon atoms in a molecule.

Solution:

Let us first identify the homologous series of the given compounds.

C3H4 and C6H10 belong to the alkynes group.

Alkynes are organic molecules made of the functional group carbon-carbon triple bonds and are written with the empirical formula of CnH2n-2. They are unsaturated hydrocarbons.  

Molecular formula of an aklyne with five carbon atoms will be C5H(2*5-2) = C5H8. The chemical name of the compound is Pentyne.