When ${\text{F}}_3\text{C}-\stackrel{\stackrel{\text{O}}{\text{||}}}{\text{C}}-\text{O}-\text{OH}$  is reacted with mesitylene in the presence of BF₃, the product formed is -

Among the following, the reaction that proceeds through an electrophilic substitution, is:

In the following reactions

$\mathrm{X}$ and $\mathrm{Y}$, respectively, are:

The major product obtained in the given reaction is:

The compounds $\mathrm{A}$ and $\mathrm{B}$ in the following reaction are, respectively:

The major product of the following reaction is: