List of top Chemistry Questions on Haloalkanes and Haloarenes asked in TS EAMCET

An alcohol X($C_4H_{10}O$) is converted to corresponding chloride Y by shaking it with conc. HCl at room temperature. Reaction of Y with Mg in dry ether and then with water gave Z. What are Y and Z?

In which of the following, the compounds are arranged in the correct order of acidic strength?