1,2 - dichlorethane is a (geminal/vicinal) dihalide.

The given compound

is an example of 

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 $100\}$