Draw the isomers of pentane, hexane and heptane.

Identify the structural formula, name and unit formula of each of the polymers in the table given below:

Name of monomer	Structural formula of monomer	Name of polymer	Formula of repeating unit
Ethene		Polyethene
Propene
Chloroethene(Vinyl chloride)
Phenylethene(Styrene)
Tetrafluoroethene
prop-$2$-enenitrile
Methyl-$2$-methylpropenoate (methyl methacrylate)

State the name of the functional group in the following compound:

${\left({\mathrm{CH}}_3\right)}_2\mathrm{CHCHO}$

State the name of the functional group in the compound ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{OCH}}_2{\mathrm{CH}}_3$.

State the name of the functional group in the compound ${\mathrm{C}}_{17}{\mathrm{H}}_{35}\mathrm{COOH}$.