a hydrocarbon consist of four carbon atoms with one double bond. Predict the molecular formula of this compound

Question

anonymous · Answer

Alkynes are hydrocarbons that have a triple bond between two carbon atoms, with the formula CnH2n-2. Alkynes are traditionally known as acetylenes, although the name acetylene also refers specifically to C2H2, known formally as ethyne using IUPAC nomenclature. Like other hydrocarbons, alkynes are generally hydrophobic but tend to be more reactive.

anonymous · Answer

Hope that helps

aaronq · Answer

it says double, not triple, bonds. alkenes (or olefins) are hydrocarbons with 2 bonds.. 

just draw a chain of carbon atoms (4) then connect them with bonds, add a double bond to between a pair. Proceed to saturate their octets with hydrogens.