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Molecules whose mirror image is non-superimposable over them are known as chiral. Which of the following molecules is chiral? (i) 2-Bromobutane (ii) 1-Bromobutane (iii) 2-Bromopropane (iv) 2-Bromopropan-2-ol

Chiral molecules are those that lack a plane of symmetry as well as a centre of symmetry..
It is a chiral molecule because it lacks the plane of symmetry and the centre of symmetry.

Option (i) is the answer.