Identify the chiral molecule(s).

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Solution

The correct option is D
Chiral molecule should not have any symmetry element responsible for optical activity.

(a) It is spiro compound similar to allene system. It does not have plane of symmetry and is chiral.

(b) It has plane of symmetry therefore achiral.
(c) It has centre of symmetry therefore achiral
So, option B and C are achiral.

(d) It has a chiral centre and it will be a chiral molecule.

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