Which of the following compounds is not chiral?

$A$ body of weight $64 ~N$ is pushed with just enough force to start it moving across a horizontal floor and the same force continues to act afterwards. If the coefficients of static and dynamic friction are $0.6$ and $0.4$ respectively, the acceleration of the body is (Acceleration due to gravity $= g$)

Let $P = \{\theta : \sin \theta - \cos \theta = \sqrt{2} \cos \theta\}$ and $Q = \{\theta : \sin \theta + \cos \theta = \sqrt{2} \sin \theta\}$ be two sets,then:

The reagent used in the Wolff-Kishner reduction is

If $A$ is the areal velocity of a planet of mass $M$,its angular momentum is

If $A$ and $B$ are any two sets,then $A \cup (A \cap B)$ is equal to