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In acetylene (HCCH) there are three bonds between the two carbons.  Is this true or...

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In acetylene (HCCH) there are three bonds between the two carbons.  Is this true or false?

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Absolutely true!  Acetylene is one of the special hydrocarbons with a molecular formula of C2H2.  There is a triple bond between the two carbon atoms, making this hydrocarbon an alkyne.  Since the two carbon atoms have a triple bond between them, acetylene's two hydrogen atoms are arranged at either end, giving the molecule a 180 degree linear arrangement.  Acetylene was discovered by Sir Humphrey Davey in 1836.  It is unstable in it's purest form, and is principally used as a fuel.  The molecular formula looks something like this:

                 H-C|||C-H

(the three vertical marks between the two carbon atoms represent the triple bond)

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