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Enantiomers

d and l ena...

Question

$d$ and $l$ enantiomers are differ in :

A

Rotation of PPL

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B

Solubility in achiral solvent

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C

Chemical properties

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D

Dipole Moment

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Solution

The correct option is A Rotation of PPL
d and l enantiomers are differ in rotation of plane polarized light (PPL)

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Q. Specify chiral-enantiomers and achiral-identical pairs among the following.

Write formulae for all the isomers of the following. Designate pairs of enantiomers and achiral compounds where they exist.

1-Bromo-2-chlorocyclohexane

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. A compound is having an observed rotation of +8.4. The rotation for the pure enantiomer is calculated as +12. The composition of mixture in terms of dextrorotatory

(d)

and levorotatory

(l)

Q. R and S enantiomers differ in:

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