List of top Chemistry Questions on Alcohols asked in AP EAPCET

When vapours of alcohol X are passed over heated copper at \(573\ K\), it gives an alkene. What is X?

Which compound is formed on catalytic hydrogenation of carbon monoxide at high pressure and high temperature in presence of \(ZnO-Cr_2O_3\) catalyst? 
 

Arrange the following in decreasing order of their boiling points