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Bond formation
Synthetic organic chemistry is all about making complex molecules from simple starting materials - a process that may include several different reactions. Designing a synthesis is a bit such as chess. A grand master has to identify the pieces and the moves which can be made before planning a game strategy. To the degree that an organic chemist is concerned, he or she has to know the molecules and the type of reactions that can be performed before planning a synthetic 'game strategy'.
Certainly, there is lots of memory work included in knowing reactions, but there is a logic included also. Mainly, most reactions include electron- rich molecules creating bonds to electron deficient molecules (that is nucleophiles forming bonds to electrophiles). The bond will be formed particularly among the nucleophilic center of the nucleophiles and the electrophilic center of the electrophile.