The alcohol which gives alkene when heated with Cu/573 K is

${\left({\mathrm{CH}}_3\right)}_3\mathrm{C}-\mathrm{OH} \underset{573\mathrm{K}}{\overset{\mathrm{Cu}}{\to }} \underset{\mathrm{Iso} \mathrm{butene}}{{\left({\mathrm{CH}}_3\right)}_2\mathrm{C}={\mathrm{CH}}_2}+{\mathrm{H}}_2\mathrm{O}$

3^o alcohols undergo dehydration but not dehydrogenation.