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$\mathrm{CH}_2=\mathrm{CH}_2+\mathrm{CO}+\mathrm{H}_2 \xrightarrow{\mathrm{CO}_2\left(\mathrm{CO}_8\right.} \underbrace{\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CHO}} \xrightarrow{\mathrm{H}_2 / \mathrm{Ni}^{\circ}}$
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$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{OH}$
$\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad(1^0)$