Solution

Tertiary alcohol when passed over $$Cu$$ at $$300^{\circ}C$$ is dehydrated to alkene. $$CH_{ 3 }-{ \underset { \underset { C{ H }_{ 3 } }{ | } }{ \overset { \overset { C{ H }_{ 3 } }{ | } }{ C } } }-OH\ \overset { Cu,\ 300^{ 0 }C }{ \longrightarrow } CH_{ 3 }-{ \underset { \underset { C{ H }_{ 3 } }{ | } }{ \overset { \overset { C{ H }_{ 2 } }{ || } }{ C } } }$$ $$t-butyl\ alcohol \overset { Cu,\ 300^{ 0 }C }{ \longrightarrow } 2-methyl\ propene$$