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Q.

A racemic mixture of Lactic acid is optically inactive due to 

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a

The presence of plane of symmetry 

b

External Compensation 

c

Internal Compensation 

d

None of these

answer is B.

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Detailed Solution

The racemic mixture or (±) or dl(dextro leavo) is optically inactive due to external compensation and its specific rotation is also zero.
When equal amounts of 2 enantiomers are mixed together, it gives an optically inactive form called Racemic mixture.

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