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?

Discuss the physiological action of ethyl alcohol when it is consumed.