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Propadiene
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<p>Propadiene or allene (/ˈæliːn/) is the <a href="/facts/Organic_compound/gqCNaN45">organic compound</a> with the formula H2C=C=CH2. It is the simplest <a href="/facts/Allene/54hMEu5N">allene</a>, i.e. a compound with two adjacent carbon <a href="/facts/Double_bond/qDemMn0c">double bonds</a>. As a constituent of <a href="/facts/MAPP_gas/wSJsWA26">MAPP gas</a>, it has been used as a fuel for specialized <a href="/facts/Welding/6EJ62mYV">welding</a>. </p>