Question
Molecules whose mirror image is non superimposable over them are known as chiral. Which of the following molecules is chiral in nature?

Answer

The objects which are nonsuperimposable on their mirror images are called enantiomers.
It occurs on that molecule which contains asymmetric carbon or chiral (i.e., a carbon atom attached with four different groups$.)$
in the present case a molecule of $2-$ Bromobutane $\ce{[CH_3 CH_2 C*H(Br) CH_3]}$ is a chiral molecule because,
  1. It contains a chiral carbon atom marked as $(C^*).$
  2. Its mirror image is non$-$superimposable over them.

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