Question

a hydrocarbon molecules has three carbon atoms write down its molecular formula if it is an alkane alkene alkyne

Answer 1

..The general formula of alkynes is
CnH2n – 2 where n is the number of carbon atoms in one molecule of the alkyne.Out of the above given hydrocarbons C2H2 and C3H4 are alkynes (because they correspond to the general formula CnH2n – 2 with n = 2 and n = 3, respectively).Please note that in an alkyne molecule, "the number of hydrogen atoms" is "2 less than double the number of carbon atoms".

Answer 2

for the alkane ......C3H8......propane

for alkene.............C3H6........propene

for alkyne............C3H4........propyne


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