Chemistry - STEREO ISOMERISM Question with Solution | TestHub
10 gm of
is dissolved in water to make 100 ml solution. It is kept in 30 cm polarimeter tube. It produced an optical rotation of –3.6º. Calculate [α] specific angle of rotation for
under identical circumstances of temperature.
Options:
Answer:
Solution:
Identify the Isomer Type: The second molecule is meso-tartaric acid, which contains a plane of symmetry () in its eclipsed conformation.
Optical Activity of Meso Compounds: Due to the internal compensation of optical rotation between its two symmetrical halves, meso compounds are achiral.
Specific Rotation Value: Since achiral (meso) molecules are entirely optically inactive, their specific angle of rotation is always zero.
Conclusion: Therefore, under any identical circumstances, its specific rotation is , making the given data for the first molecule redundant.
