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The rate of an $S_N1$ reaction may be increased by increasing the polarity of the solvent of reaction. Because, the more polar a solvent (as measured by the dielectric constant / relative permitivity, the easier to separate ions from each other; here: carbocation and its counter anion. Contrary to polar-aprotic solvents (think DMF, DMSO) eventually leading ...


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Groups are neither soluble neither insoluble. They contribute on substance solubility or insolubility. Their polarity relates to dipole moments of respective chemical bonds which relate to the difference of atom electronegativities. The effect of a group must be related to whole molecule, considering overall structure. E.g. methanol or acetic acid are polar ...


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