In a reaction, reagents ' X ' and ' Y ' respectively are:

$\displaystyle \left(\mathrm{CH}_3 \mathrm{CO}\right)_2 \mathrm{O} / \mathrm{H}^{+}$and $\displaystyle \left(\mathrm{CH}_3 \mathrm{CO}\right)_2 \mathrm{O} / \mathrm{H}^{+}$

$\displaystyle \mathrm{CH}_3 \mathrm{OH} / \mathrm{H}^{+}, \Delta$ and $\displaystyle \left(\mathrm{CH}_3 \mathrm{CO}\right)_2 \mathrm{O} / \mathrm{H}^{+}$

$\displaystyle \left(\mathrm{CH}_3 \mathrm{CO}\right)_2 \mathrm{O} / \mathrm{H}^{+}$and $\displaystyle \mathrm{CH}_3 \mathrm{OH} / \mathrm{H}^{+}, \Delta$

$\displaystyle \mathrm{CH}_3 \mathrm{OH} / \mathrm{H}^{+}, \Delta$ and $\displaystyle \mathrm{CH}_3 \mathrm{OH} / \mathrm{H}^{+}, \Delta$