IIT JEE , AIEEE Forum - Chemistry , Organic Chemistry - i optical isomeres why assymmetric carbon atom is used there is 1 exception which is that?

rajeshwary

in optical isomer why asymmetric carbon atom is used and not symmetric and which is 1 optical isomers containing symmetric carbon atom but still opticaly active?

rajeshwary

pls i want answer now its urgent

dev_22oct

allenes are optically active bt they are devoid of chiral centre.

in allenes the central carbon is sp bonded. the remaining two p orbitals are perpendicular to each other , and each overlaps the p orbital of one adjacent carbon atom forcing the two remaining bonds of each carbon into perpendicular planes therefore the allenes of type ABC=C=ABC(A

B) are chiral.

and thus allenes exist as entiomer without having chiral centre

dev_22oct

Q in optical isomer why asymmetric carbon atom is used and not symmetric ?

Ans) becoz the mirror image of symmetric compound is superimposable becoz they are identical whereas in asymmetric the mirror images is nonsuperimposable becoz they are not identical and exists as enantiomers.

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