The carboxylic acid with highest $\mathrm{p} K_a$ and lowest $\mathrm{p} K_a$ values of the following respectively are

What are the major products $X$ and $Y$ respectively in the following set of reactions?

The structures of succinic acid $(x)$ and malonic acid $(y)$ respectively are

$$ \text { The final product }(C) \text { in the given reaction sequence is } $$

$$ \mathrm{C}_6 \mathrm{H}_5 \mathrm{COOH} \xrightarrow{\mathrm{SOCl}_2}(A) \xrightarrow[\text { anhy } \cdot \mathrm{AlCl}_3]{\mathrm{C}_6 \mathrm{H}_6}(B) \xrightarrow[\text { (ii) } \mathrm{KOH}_4 /\left(\mathrm{CH}_2 \mathrm{OH}\right)_2]{\text { (i) } \mathrm{NH}_2-\mathrm{NH}_2}(C) $$