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Chiral Centres and Chirality

Do diastereom...

Question

Do diastereomers have optical activity?

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Solution

Diastereomers:
Diastereomers are those compounds that have the same molecular formula but also have non-superimposable non-mirror images.
These compounds are optically active stereoisomers.
For example: $Cis and trans - 2 - butene$ , $(R, S) and (S, S) 3 - bromo - 2 - butanol$ .
Therefore, diastereomers have optical activity.

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Q. Why the tetrahedral complexes having four differnt groups to central atom do not show optical activity ?

Q. An organic compound having a carbon attached to four different groups is optically active. But, is the opposite also true? That is, do all optically active organic compounds have chiral carbons? Not necessarily. Presence or absence of chiral centre is not the sufficient criterion for optical activity. The ultimate criterion is the presence or absence of either plane or centre of symmetry. Two compounds which are non-superimposable mirror images of each other are called enantiomers. If a compound contains more than one chiral carbon, new words are required to describe the relationship between various stereoisomers of the compounds. Those words are diastereomers and mesomers.

Optically active compounds among the following is :

Q. An organic compound having a carbon attached to four different groups is optically active. But, is the opposite also true? That is, do all optically active organic compounds have chiral carbons? Not necessarily. Presence or absence of chiral center is not the sufficient criterion for optical activity. The ultimate criterion is presence or absence of either plane or center of symmetry. Two compounds which are non-superimposable mirror images of each other are called enantiomers. If a compound contains more than one chiral carbon, new words are required to describe the relationship between various stereoisomers of the compounds. Those words are diastereomers and mesomers.
Optically active compounds among the following is/are
(A)

C H_{3} - C H = C = C H_{2}

C H_{3} - C H = C = C H - C H_{3}

Q. Meso compound do not show optical activity because :

Meso compounds do not show optical activity because they

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