JEE Advanced Chemistry question

Which of the following statements are not correct? A meso compound is optically inactive because:

(A)the rotation caused by any molecule is cancelled by an equal and opposite rotation caused by another molecule that is the mirror image of the first
(B)A meso compound has chiral centres but exhibits no optical activityCorrect
(C)A meso compound has no chiral centres and thus exhibits no optical activityCorrect
(D)A meso compound has molecules which are superimposable on their mirror image even though they contain chiral centres

Answer: (B),(C)

Solution

A meso compound contains two or more chiral centres, but possesses an internal plane (or point) of symmetry, so the rotation caused by one half of the molecule is exactly cancelled by the opposite half of the SAME molecule (internal/intramolecular compensation) — this makes the molecule as a whole achiral and

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Question ID VK-159252