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WHY OPTICAL ISOMERISM IS NOT POSSIBLE IN CASE OF DOUBLE BOND?
optical isomerism is a type of sterioisomerism
remember that sterioisomerism is a type of isomerism in which the attached groups differ in spatial arrangement
this is possible only of the bonds are rotatable
it means that if a single ond is there we can rotate it along that axis.but if a double bomd or triplebond is therewe cant roate it
if you try to rotate it the pi bond will be broken
to understand this do an experiment.
take two small balls and attach those both with a small stick and try to rotate one ball kepping another ball fixed in your hand.
repeat the expirement by attaching those two balls with two or three sticks and try to rotate that ball.
you will be able to rotate the two balls only if one of the bonds is broken
from this we can conclude that optical isomerism is not possible in doubly or triply bonded carbon bonded compound.
in case of double bonds,there is no free rotation about the bonds like that in tha case of single bond....hence no optical isomerism....
For an optically active compund, there should be an chiral carbon, and for a chiral carbon all the atoms should be sp3 hybrized. That is possible only when all the atoms are singally bonded.
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