What is the general formula of a saturated hydrocarbon?

Draw the structural formula of compound with two carbon atoms having $\mathrm{C}-\mathrm{C}$ double bonds.

Give the IUPAC name of the ${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{CHO}$.

Draw the structural formula of Acetylene.

Name the compound isomeric with ethyl alcohol and identify its functional group.

State two important uses of acetylene.

Name a gaseous hydrocarbon commonly used for welding purposes and give its formula.

Give the IUPAC name of acetylene.

Define isomerism.