An organic compound $\mathrm{A}$ on treatment with benzene sulfonyl chloride gives compound $\mathrm{B}$. $\mathrm{B}$ is soluble in dil. $\mathrm{NaOH}$ solution. Compound $\mathrm{A}$ is :

Consider the given reaction, percentage yield of :

Considering the above reaction, $\mathrm{X}$ and $\mathrm{Y}$ respectively are:

In the above chemical reaction, intermediate "$\mathrm{X}$" and reagent/condition "$\mathrm{A}$" are :