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Introduction to Water

naturally onl...

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naturally only 1 of either +(d) or -(l) form is present for a compound? while both D and L forms can be present in nature for a compound?

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Statements:
L * D
D # K
K $ J

Conclusions:

a) L * K

b) D $ J

Q. When both d and l isomers are present in equal amounts, it is known as a:

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. Assertion :Resonance is exhibited by a circuit only if both L and C are present in the circuit. Reason: Only then the voltage across L and C cancel each other, both being out of phase

Q. Question 3
The most appropriate definition of a natural resource is that it is a substance/commodity that is

(a) present only on land
(b) a gift of nature which is very useful to mankind
(c) a man-made substance placed in nature
(d) available only in the forest

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