Mechanisms for this type of reaction (-5[1])are discerned by the parameter m in the Grunwald–Winstein equation. It’s not alkylation, but the presence of sulfur in mustard gas increases the rate of one of these (-5[1])reactions in a classic example of anchimeric (“an-kye-MER-ic”) assistance. (-5[1])Carbocation (10[1])(“carbo-CAT-eye-on”) intermediates act as (10[1])Lewis acids in one of these reactions. (10[3]-5[1])In one type of this reaction, (10[1])inversion of configuration (10[3])occurs (10[6])due to a (10[1])“backside (10[2])attack.” (10[19]0[1]-5[2])A (10[1])pentavalent (10[1]-5[1])transition state occurs (10[1])in one type of this reaction (10[1])whose name indicates that it is bimolecular. (10[2])High temperatures (10[2])or bulky bases cause eliminations to be (-5[1])favored over these reactions. (10[3])For 10 points, (10[1])the nucleophilic SN1 (-5[1])and (0[1])SN2 mechanisms exemplify (10[1])what type of (10[1])reaction, (10[1])in which one group of a compound is exchanged (10[1]-5[1])for another? (10[2])■END■ (10[6]0[2])