Give IUPAC names for each of the following alkanes and cycloalkanes:

1. 
   
2. ${\mathrm{H}}_3\mathrm{C}-{\mathrm{CH}}_3$
   
3. 
   
4. 

We need to give IUPAC name of following compound:

As the given compound contains $5$carbon atoms in straight chain and all are single bonds. So compound is alkane with five carbon atom. Hence, IUPAC name of compound is pentane.

We need to give IUPAC name of following compound:${\mathrm{H}}_3\mathrm{C}-{\mathrm{CH}}_3$

As the given compound contains $2$ carbon atoms in straight chain and all are single bonds. So compound is alkane with two carbon atom. Hence, IUPAC name of compound is ethane.

We need to give IUPAC name of following compound:

As the given compound contains $6$ carbon atoms in straight chain and all are single bonds. So compound is alkane with six carbon atom. Hence, IUPAC name of compound is hexane.

We need to give IUPAC name of following compound:

As the given compound contains $7$carbon atoms in closed ring structure and all are single bonds. So compound is cycloalkane with seven carbon atom. Hence, IUPAC name of compound is cycloheptane.