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

constitutional isomerism

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geometrical isomerism

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identicalness

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optical isomerism

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Solution

The correct option is B optical isomerism

Both are optical isomers because they rotate the plane of polarised light in opposite directions as both are mirror images of each other.

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85

50.0 g

(C_{5} H_{10} O_{5}) = 150 g / m o l,

(C_{3} H_{6} O_{3}) = 90 g / m o l

Formula of Lactic Acid

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