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.

Name the compound prepared by the reaction of $-{\mathrm{CaC}}_2+2{\mathrm{H}}_2\mathrm{O}$.

How will you distinguish between ethylene and acetylene?