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  4. The optical rotaion of an optically active compound is

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Q. The optical rotaion of an optically active compound is

J & K CETJ & K CET 2009Organic Chemistry – Some Basic Principles and Techniques

Solution:

$\alpha=\frac{\text { observed rotation }}{\text { length }( dm ) \times \text { concentration }}$
$\therefore $ observed rotation $=\alpha \times l \times c$
Thus, optical rotation of an optically active compound is directly proportion to both length of the polarimeter and molar concentration.