which of the following dehydrogenation of ethanol in the presence of Cu at 573K to produce?

${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}\underset{573\mathrm{K}}{\overset{\mathrm{Cu}}{\to }}?$

At 573 K, the catalyst is used to dehydrogenate ethanol into acetaldehyde by passing it over heated copper.

${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}\underset{573\mathrm{k}}{\overset{\mathrm{Cu}}{\to }}{\mathrm{CH}}_3\mathrm{CHO}+{\mathrm{H}}_2$