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What will be the effect on the plane of plane polarised light when it passes through a solution of dlbutan-2-ol?(a) Clockwise rotation(b) Anti-clockwise rotation(c) Zero rotation(d) 180° rotationI have been asked this question during an online exam.Question is from Haloalkanes & Haloarenes in section Haloalkanes and Haloarenes of Chemistry – Class 12

Answer» CORRECT answer is (c) Zero rotation

To elaborate: dlbutan-2-ol represents a MIXTURE of dbutan-2-ol (dextro) and lbutan-2-ol (laevo), and is called a RACEMIC mixture. There optical rotation due to ONE isomer will cancel the rotation due to the other and will have no effect on the polarised light passed through it.


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