Consider the following compounds/species: (Structures missing). The number of compounds/species which obey Hückel's rule is:
5
4
6
2
According to Hückel's rule, a ring system is considered aromatic if it satisfies the following criteria: (i) Planarity, (ii) Complete delocalisation of the electrons in the ring, and (iii) Presence of electrons in the ring, where is an integer () . Without the specific structures, we cannot determine exactly which ones obey the rule, but by evaluating each given structure against these three criteria, the total count of aromatic species can be determined.
Note: The specific chemical structures were missing from the input data. The correct option is marked based on the provided probable answer.
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