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Stereoisomerism

Indicate whet...

Question

Indicate whether each of the following pairs are identical, enantiomers or diastereomers:

A

I - enantiomers II - diastereomers III - enantiomers

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B

I - identical II - enantiomers III - enantiomers

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C

I - enantiomers II - diastereomers III - identical

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D

I - enantiomers II - identical III - identical

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Solution

The correct option is C I - enantiomers II - diastereomers III - identical

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Similar questions

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

Q. For each of the following pair, deduce the stereochemical relationship, i.e., whether they are enantiomers, diastereomers or identical.

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. Compounds which are not enantiomers are diastereomers

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

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