Draw three structural formulae having molecular formula ${\mathrm{C}}_5{\mathrm{H}}_{12}$.

Give the names n-pentane, i-pentane and neopentane to the structural formulae of ${\mathrm{C}}_5{\mathrm{H}}_{12}$.

Draw all the possible structural formulae having molecular formula ${\mathrm{C}}_6{\mathrm{H}}_{14}$. Give names to all the isomers

Complete the table by writing their IUPAC names in the third column.