Question

Using the criteria for aromaticity, determine if the following molecules are aromatic antiaromatic or non aromatic. Explain your answer.

Answer 1

for a compound to be aromatic it mulst fulfill these critérias serially (i) Must be cyclic (ü) The compound should by in only one plane. (ü) the system should be conjugated , that is resonance should be possible. (iv) It should have (Win + 2) pi electrons. In case of anti-aromatic compounds it should fulfill all the first (3) mentioned above criterias and should have (4n) pi electrons. ( where r = 0,1,2,....)

Non-aromatic since, it is cyclic but still an unconjugated systesm , as one of the C is sp; hybridised and hence resonance is not possible TIME, Aromatic since, First it is cyclic Second, it is a conjugated system, hence resonance possible. Third, it has (4m + 2) that is 6 et's :. It follows Huckel'o rule Anti-aromatic Since, First, it is cyclic Second, it is a conjugated system, hence resonance possible Third, it has (4n) that is ha el's

Non- aromatic Since, It is cyclic but not a conjugated system as one of the c is spo hybridised, therefore resonance is not possible. Aromatic Since, li) It is cyclic lü) Conjugated system, hence resonance possible (ü) (46+2) éis where n = 1 Hence satisfy Huckel's rule NANIMOWARDS
Sorry for wrong sequence.

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