Alchen
Câa
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I alchen a hinn compòst organegh idrocarbur con formula general CnH2n. A hinn connossuu anca cont el nòmm "olefin". Come per i alcan, i atom de carbòni chì a hinn ligaa intra de lor con ligamm covalent per formà cadenn vert, linear ò cont i bròcch, ma duu atom arent a hinn ligaa cont on ligamm covalent dobbi.