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Ch3-ch2-Ch= h3c-c=o=h. H3c Ch Ch ch3 ch2 c o Oh. Ch3-c=o-ch3+ h2=. C2h2=ch3―Ch=o.
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Ch3-ch2-Ch= h3c-c=o=h. H3c Ch Ch ch3 ch2 c o Oh. Ch3-c=o-ch3+ h2=. C2h2=ch3―Ch=o. 