Hydrocarbon which gives oxyacetylene flame

The hydrocarbon that burns with a clean flame is

(A) : Acetylene is used in oxyacetylene flame (R ) : The heat of combustion of acetylene is more than that of ethane or ethylene

Give reasons: a) Pure ethanoic acid is known as glacial acetic acid. b) Ethanol is used as an antifreeze in car batteries. c) Ethanol mixed with methanol is known as denatured alcohol. d) Oxyacetylene flame is used for welding. e) Gasoline is used as a fuel in western countries.

What is Hydrocarbon? Give example.