What is ethanol containing a small amount of methanol called?

In the given reaction,$[X]$ is:

Amongst the following compounds,identify which are insoluble,partially soluble,and highly soluble in water:
$(i)$ phenol,$(ii)$ toluene,$(iii)$ formic acid,$(iv)$ ethylene glycol,$(v)$ chloroform,$(vi)$ pentanol.

Product $(B)$ is

When ethyl alcohol $({C_2}{H_5}OH)$ reacts with thionyl chloride,in the presence of pyridine,the product obtained is

$A$ on heating isomerizes to $B$. What is the structure of $B$?