In an organic reaction the starting compounds A₁ ... A_n transform into the compounds B₁ ... B_m, whose symbols, charges and electrons are the same as in A₁ ... A_n and occur exactly as often as in A₁ ... A_n.

Any combination of the compounds B₁, ..., B_m is produced by or obtained from or synthesized in the reaction.

An example of an organic reaction, the aldol condensation, is given in Figure 1.2. Here the upper formula of two compounds transforms into the lower formula of two compounds.

A compound obtained from the reaction in the above example of Figure 1.2, is crotonaldehyde which is represented in Figure 1.3.
 
 

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