The major product of the following reaction is:

Given below are two statements:

Statement I: and are isomeric compounds.

Statement II: and are functional group isomers.

In the light of the above statements, choose the correct answer from the options given below:

Match List - I with List - II.

Arrange the following in increasing order of solubility product :

$\mathrm{Ca}(\mathrm{OH})_2, \mathrm{AgBr}, \mathrm{PbS}, \mathrm{HgS}$