List the uses of crown ethers.

The CORRECT IUPAC name of the compound given below is

From following, IUPAC name of compound  is?

What is the IUPAC name of the following compound?

Write IUPAC names of the following ether.

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 $100\}$