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Q. The well known compounds, $(+) -$ lactic acid and $(-) -$ lactic acid, have the same molecular formula, $C_{3} H_{6}O_{3}.$ The correct relationship between them is

WBJEEWBJEE 2012Organic Chemistry – Some Basic Principles and Techniques

Solution:

Both are optical isomers because they rotate the plane of polarised light in opposite directions.

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