What is 'Z' in the given set of reactions?
C$_6$H$_5$OCH$_3$ $\xrightarrow{HI}$ X + Y
Y $\xrightarrow[\text{Anhy. AlCl}_3]{\text{C}_6\text{H}_6}$ Z
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Cleavage of mixed ethers (R-O-R') with HX follows an S$_N$2 mechanism. The halide ion (X$^-$) attacks the smaller, less hindered alkyl group. If one of the groups is tertiary, it follows an S$_N$1 mechanism. Phenyl-oxygen bonds are very strong and do not break under these conditions.
