Who first observed that crystals with mi...

Who first observed that crystals with mirror images of each other exist?

Louis Pasteur

Jean Baptiste Biot

Hermann Kolbe

van't Hoff

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The foundation of medern sterochemistry was laid when Louis Pasteur observed (in `848)` that optically inactive sodium ammonium tartrate existed as a mixture of two different kinds of crystals which were mirror images of each other. Using a hand lens and a pari to tweezers, he carefully and laboriously spearated the mixture into two tiny polesone of light-handed crystal and the other of left-handed crystals-in exactly the same way as one might separate right-handed and left-handed gloves lying jumbled toghter on a shop counter.

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Stereoisomers which are not mirror image of each other, are called.:

Enantiomers

Tautomers

Meso

Diastereomers

Optical isomers which are non-superimposable mirror images of each other are called

Enantiomers

Diastereomers

Tuatomers

Geometrical isomers

Assertion: Stereoisomers which are not mirror image of each other are called diastereomers. Reason: Disasteromers may or may not be optically acitve.

If both assertion and reason are true and the reason is the correct explanation of the assertion.

If both assertion and reason are true and the reason is not the correct explanations of the assertion

If assertion is true but reason is false.

If assertion is false but reason is true.