Chirality in chemistry - without 4-coordinate carbon.

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                                                                                        Aisha Ali

Chirality in chemistry - without 4-coordinate carbon

Chirality is a term which may be applied to any asymmetric object or molecule. It is the property of non-identity of an object with its mirror image. A chiral compound is one which is not superimposable on its mirror image. This property of molecules has a great importance in the chemistry feild as it provides us with an understanding of the shapes of molecules which then in turn, gives us an insight on the way they react in a particular reaction. Chirality in chemistry is described in many ways but the universal defination of chirality was given by Lord Kelvin in 1904 who defined chirality in his ‘Baltimore Lectures’ on ‘Molecular Dynamics and the Wave Theory of Light’ as "I call any geometrical figure, or group of points, chiral, and say it has chirality, if its image in a plane mirror, ideally realized, cannot be brought to coincide with itself."

Say if a left hand was transplanted in the place of the             right hand. Now if we try and shake hands with someone else, it would not be possible. Whichever way the left hand was transplanted, the fingers would seem to be inverted. The         moral is that the left hand and the right hand are different. On the other hand, the left hand and the right foot are also different. However, we may feel there exists a relationship between the left hand and the right hand that doesn't exist between the left hand and the rig

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ht foot. If we put the left hand up to a mirror. The reflection in the mirror is of a right hand. So this proves that the  left and right hands are mirror images.

Not all objects behave like a pair of hands. If we take a water glass, for example, it is identical to its image in the mirror. The underlying issue is the identity of an object and its reflection. Any object that is different from its reflection is said to be chiral. Otherwise, it is called achiral. The left hand and the right hand ...

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