The structural formula of a hydrocarbon is given below. Write its molecular formula.

A molecular formula represents the total number and types of atoms in a molecule but does not provide information about the arrangement of atoms or bonds. It simply gives the count of each element in the compound. The given compound contains four carbon atoms and eight hydrogen atoms. Therefore, the molecular formula is C 4 H 8 .

The structural formula of a hydrocarbon is given below. Draw the structure of the first compound of the homologous series to which this hydrocarbon belongs.

The given structure represents 1-butene, which belongs to the homologous series of alkenes (unsaturated hydrocarbons with at least one carbon-carbon double bond). The first compound in this homologous series is ethene ( C 2 H 4 ) , which is the simplest alkene. The structure of ethene is :

The structural formula of a hydrocarbon is given below. Write the IUPAC name of this compound.

The given structure contains four carbon atoms in the main chain and the rootword is 'but-'. The double bond is present between the first and second carbon atoms. Therefore, the IUPAC name of the compound given is 1-butene.