[![carboxylic derivatives][1]][1]

While solving Carboxylic derivatives recently, I came across this. 
so following the reagents one by one-

1)**SOCl₂** will form acid chloride.

2)**CH₂N₂**(diazomethane) on the other hand reacts with carboxylic acid to give-METHYL ESTER.but we are currently on acid chloride, this part is a little confusing to me.

3)**Ag₂O** in aqueous/alcoholic medium should give (CH₃O−) ions.

overall im just lost. I need some **hints.**

  [1]: https://i.sstatic.net/63Uq3.png