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  4. Number of optical isomers of lactic acid are

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Q. Number of optical isomers of lactic acid are

Organic Chemistry – Some Basic Principles and Techniques

Solution:

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Only one chiral centre. Hence, two optical isomers are possible.
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No. of optical isomer $=2^{n}$ (where $n=$ no. of chiral carbon) $=2^{1}=2$.