Which of the following statements are correct?....

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Which of the following statements are correct?
(1) A meso compound has chiral centres but exhibit
P
no optical activity
W
(2) A racemix mixture is optically inactive because of two equal and opposite rotations of same isomers of the molecules in the mixtures
(3) A meso compound has molecules which are super imposable on their mirror image even through they contain chiral centres
(4) A meso compound is optically inactive because the rotation caused by any moleucle is cancelled by an equal and opposite rotation caused by another molecule that is mirror image of the first


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