Question

The electrophilic substitution of arenes with chlorine and bromine produces ortho and para isomers of the aryl halide. Based on what property can they be separated?

Answer 1

Dear student, The ortho and para aryl halides (having same molecular formula) are differ in their melting points. The melting point of para-isomer is comparatively high than the corresponding ortho and meta-isomers. The para isomers are symmetrical in nature hence better fit in crystal lattice which increase the intermolecular force of attraction between molecules. so, they melt at higher temperatute. To separate ortho and para halides , at first solidify it. Then increase the temperature slowly. The ortho aryl halide will melt first. Separate out the melted liquid as ortho aryl halide. Regards