Explain the general structure of ester.

The decreasing order of ease of alkaline hydrolysis for the following esters is

The most suitable reagent $\mathrm{A}$, for the reaction


 is/are

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$

$\stackrel{\mathrm{R}\mathrm{C}{\mathrm{O}}_3\mathrm{H}}{\to }\mathrm{ }\mathrm{A}\mathrm{ }\stackrel{\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}}{\to }\mathrm{ }\mathrm{B}$ 

Correct option is?