Shape of C₂H₂ molecule

What is the shape of the $\ce{C2H2}$ molecule? 


The fact that is has a triple covalent bond between the 2 carbon atoms and 2 other bonding pairs between the hydrogen and carbon atoms leads me to believe that it could be linear shape.


However, I'm not sure if the triple bond counts as a single electron bonding pair or 3. If it counts as 3 bonding pairs then the molecule would have 5 overall, and therefore be a trigonal bipyramidal shape.


So is it octohedral or linear? Pretty sure it's linear 




According to [VSEPR theory](http://en.wikipedia.org/wiki/VSEPR_theory), each carbon has **2** electron "pairs". These electron pairs are not what you would typically think of as electron pairs because VSEPR theory considers double bonds and triple bonds to still be a single "pair".


So considering each carbon atom, the shape is $AX\_2E\_0$ ($A$ is the carbon atom, $X$ is a bonding pair of electrons, and $E$ is a non-bonding pair (lone pair) of electrons). 


$AX\_2E\_0$ corresponds directly to a *linear* molecule. 


To directly answer your question, when trying to determine the shape of a molecule, consider double and triple bonds as only a single electron bonding pair. 


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