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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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||Enantiomers ||

Knowledge Check

  • Enantiomers are

    A
    molecule that have at least one chiral carbon
    B
    non-superimposible molecules that are mirror images of one another
    C
    non-superimposible constitutional isomers
    D
    non-superimposible molecules

  • Enantiomers have

    A
    identical melting point/boiling point but different refractive indices
    B
    identical melting point/boiling point and refractive indices but rotate plane polarised light in opposite directions but to the same extent
    C
    different refractive indices and rotate plane polarized light in the same direction but to different extents
    D
    different melting/boiling points but rotate plane of polarised light in diferent directions but to the same extents.

  • Which of the following compounds will undergo racemization on prolonged digestion of either of its enantiomers with a dilute acid or base?

    A
    `CH_(3)CH_(2)CHCICH_(3)`
    B
    `CH_(3)CH_(2)CHBrCH_(3)`
    C
    `overset(CH_(3))overset(|)(CH_(3)CH_(2)CHCH(CH_(3))_(2)`
    D
    `CH_(3)CH(OH)COOH`

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    Enantiomers have:

    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

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