Chemistry - STEREO ISOMERISM Question with Solution | TestHub
ChemistrySTEREO ISOMERISMCALCULATION OF TOTAL STEREOISOMERSEasy2 minQB
ChemistryEasysingle choice
How many stereoisomers are possible for a molecule having the formula C(A*)3 where A* represents an asymmetric centre attached to the central carbon (three identical chiral arms) ? Are all of them optically active ?
Options:
Answer:
D
Solution:
Ans. 4 stereoisomers; yes, all of them are optically active.
Sol. With three identical asymmetric arms on the central carbon, the configurations are enumerated up to the C3 rotation of the molecule:
(R,R,R) and (S,S,S) : a pair of enantiomers, both optically active.
(R,R,S) and (S,S,R) : a second pair of enantiomers, both optically active.
No arrangement has a plane of symmetry (any mirror would interchange R and S arms), so all 4 stereoisomers are optically active - unlike C(A*)4, which has meso forms.
Stream:JEESubject:ChemistryTopic:STEREO ISOMERISMSubtopic:CALCULATION OF TOTAL STEREOISOMERS
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