1. Guanine (1) is commonly represented as a non aromatic, partially saturated heterocycle. However, the common structure of guanine is only one of two possible resonance forms, of whom the second one is clearly aromatic. Knowing that the latter is originated by the delocalisation of one of N6 (nitrogen six) lone pair on the ring, would you be able to predict the structure of the aromatic resonance structure of guanine? Guanine 1 N. NH 3 N- R 1 Why cannot N4 delocalise its lone pair on the ring? What about N3? Is its lone pair delocalised on the pyrimido-imidazole ring? Why?

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Bond Parameters

Many factors decide the covalent bonding between atoms. Some of the bond parameters are bond angle, bond order, enthalpy, bond length, etc. These parameters decide what kind of bond will form in atoms. Hence it is crucial to understand these parameters in detail and understand how changing these parameters affects the kind of bonding or various characteristics.

Bond Dissociation Energy

The tendency of an atom to attract an electron is known as its electronegativity.