A new meme called Skeptical Third World Kid takes a blunt dig at the world of humanitarian aid by highlighting common stereotypes with LOLcats-style
3 electrons *per carbon*
Maybe you're already aware of that, and you thought it was implied in your if you go and say something like "the carbon-carbon bond in acetylene has 3 electrons" around an organic chemist, you'll get e are SIX electrons in that thar triple-bond.
Now, the reason that acetylene is high energy is NOT because of asymmetry (unless you know something I don't - link?).In fact, unless I'm missing some subtle point of yours, nature doesn't "like" symmetry at all.A carbon-oxygen bond is highly electrons around the oxygen, which likes electrons, and the carbon ends up with a small positive 's why the carbons are *oxidized* in the OP's reaction equation - the oxygen atoms suck electrons away from the of electrons is called "oxidation".
Acetylene is high in energy because of high electron carbon-carbon triple bond contains one sigma bond and two pi sigma bond is a stable bond, but each successive bond between the two carbons is less stable than the all six electrons are shared between the two carbons, you have very high electron density sitting between the trons repel each other, and carbon nuclei don't particularly like high electron density (they have relatively low electronegativity).So the electrons will be much more stable sitting in a polarized double-bond with a highly electronegative atom (oxygen).