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Fischer Projection

The correct s...

Question

The correct statement about the compounds A, B and C is

A

A and B are identical

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B

A and B are diastereomers

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C

A and C are enantiomers

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D

A and B are enantiomers

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Solution

The correct option is D
A and B are enantiomers

The rotation of ‘B’ by 180⁰ in the plane of the paper produces mirror image of ‘A’. Further ‘A’ and ‘C’ as well as ‘B’ and ‘C’ are diastereomers.

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Q. The correct sequence of relationships between the compounds of pairs (i) - (iv) respectively is:

Q. Compounds which are not enantiomers are diastereomers

A schematic analysis of the reaction of one enantiomer with racemic mixture is shown below

\begin{matrix} d & + & d a n d l & \to & (d) - (d) T h e (+) f o r m o f & A r a c e m i c m i x t u r e o f & + c h i r a l m o l e c u l e s & o t h e r m o l e c u l e s w i t h & (d) - (l) 50 % (d) a n d 50 % (l) \end{matrix}

The products (d-d) and (d-l) are clearly neither identical nor enantiomers (non-superimposable mirror images) as the mirror image of (d-d) is (l-l) not (d-l). They are diastereomers, 'stereoisomers that are not mirror images'.

The formation of diastereomers allows the separation of enantiomers (called resolution) which is not easy as enantiomers have identical physical properties. One general procedure for separating enantiomers is to allow them to react with naturally occurring chiral molecule to form a pair of diastereomers. These can be separated easily as they have different physical properties. if the original chemical reaction can be reversed, the enantiomers can be isolated.

Which of the following is an example of diastereomers?

Q. How to write R,S nomenclature or R,S configuration for a given projection? And how to determine whether the given two compounds are enantiomers or diastereomers using R,S configuration?

Q. Compounds which are not enantiomers are diastereomers – True or False?

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