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An enantiomer and its racemic form have...

An enantiomer and its racemic form have

A

equal and opposite rotation

B

unequal and oppoiste rotations

C

equal and identical rotations

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
D
Enantiomers are optically active while the racemate (mixture containing the two enantiomers in equal propertions) is optically inactive (i.e. it does not rolate the plane of polarixed light) dut to external compensation. Other physical properties, such as crystalline form, melting point, and solubility fo an enantiomer and its racemate may differ. The chemical properyies are the same towards achiral reagents but chiral reagents react at different rates.
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A schematic analysis of the reaction of the enantiomer with racemic mixture is shows below: {:(d,+,"d and l",rarr,(d)-(d)),("The(+)-form of",,"A racemic mixture of",,+),("chiral molecules",,"other molecules with",,(d)-(l)),(,,50%(d) and 50%(l),,):} The products (d-d) and (d-l) are clearly neither identical nor enantiomers (non-superimposable mirror images) as the diastereomers, stereoisomers that are not mirror images' . The formation of diasteromers allows the separation of enantiomers (called resolution) which is not easy as enantiomers have identical physical properties. One general 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. How many diastereomers are possible among all the possible stereoisomers of 2,3-dibromopentane ?

A schematic analysis of the reaction of the enantiomer with racemic mixture is shows below: {:(d,+,"d and l",rarr,(d)-(d)),("The(+)-form of",,"A racemic mixture of",,+),("chiral molecules",,"other molecules with",,(d)-(l)),(,,50%(d) and 50%(l),,):} The products (d-d) and (d-l) are clearly neither identical nor enantiomers (non-superimposable mirror images) as the diastereomers, stereoisomers that are not mirror images' . The formation of diasteromers allows the separation of enantiomers (called resolution) which is not easy as enantiomers have identical physical properties. One general 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 ?

A schematic analysis of the reaction of the enantiomer with racemic mixture is shows below: {:(d,+,"d and l",rarr,(d)-(d)),("The(+)-form of",,"A racemic mixture of",,+),("chiral molecules",,"other molecules with",,(d)-(l)),(,,50%(d) and 50%(l),,):} The products (d-d) and (d-l) are clearly neither identical nor enantiomers (non-superimposable mirror images) as the diastereomers, stereoisomers that are not mirror images' . The formation of diasteromers allows the separation of enantiomers (called resolution) which is not easy as enantiomers have identical physical properties. One general 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 not true ?

Enantiomers have identical

||Enantiomers ||

R SHARMA-STEREOCHEMISTRY-Level II
  1. In which of the following properties may enantiomers differ?

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  2. According to CIP sequence rule, the correct arrangement in order of de...

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  3. An enantiomer and its racemic form have

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  4. Which of the following compounds can exist both as a cis pair of enant...

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  5. Which of the folloiwng is true for the given reaction? (S)-C(3)H(7)C...

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  6. trans-But-2-en on reaction with Br(2)in C CI(4) forms

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  7. The alkene that axhibits geometrical isomerism is

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  8. What type of isomerism is possible for 1-chloro-2-nitroethene?

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  9. In the compound configurations at the chiral carbons are

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  10. Which of the following does not show geometrical isomerism?

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  11. Which of the following compounds is not chiral?

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  12. Consider the following organic compound overset(1)CH(3)overset(2)CH(...

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  13. The compound without a chiral atom is

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  14. A molecule is said to chiral if it

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  15. Which of the following compounds will show geometric isomerism?

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  16. The most important chemical method of resolve a racemic mixture makes ...

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  17. The process of separating of a racemic mixture into d and l enantiomer...

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  18. The geometrical isomerism is exhibited by

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  19. Which of the following is a chiral compound?

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  20. Which is a pair of geometrical isomers?

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