Organic reactions are involved with a single basic mechanism that is a negative part of one reactant attacks on the positive site of other reactant and forms the final organic product. Most of the organic reactions are working on this single concept that negative part is attacking on positive part and some part getting substituted, added or left from the final adduct to form the desired product. Curly arrows are drawn from negative to positive (tail at negative and head at positive) part of the other reactants.