Which of the following cycloalkane gives open chain compound, when reacted with bromine?

Which species exhibits a plane of symmetry?

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 $100\}$

The correct order of reactivity of $\mathrm{I}, \mathrm{II} \text{and} \mathrm{III}$ towards addition reactions is:

A compound $\mathrm{P}$ Gives only two monochloro product on chlorination (excluding stereoisomers)  P is