claisen condensation reaction claisen schimdt reaction beckmann rearrangment openour oxidation dakin reaction metal hydride reduction clemenson reduction thiophene furan pyrrole cyclohexane butane conformation of etahane stereo specific and stereo selective reactions determination of geometrical isomer syn and anti e&z nomenclature cis-trans isomer geometrical isomer resolution of racemic mixture diasteromers meso compounds d& l isomer r& s isomer optical isomerism evidences for benzene structure reactions of benzene synthesis of benzene aromaticity benzene
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