Identify the nitrogen atom that does not cont | vedclass

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(A) The basicity of a nitrogen-containing compound depends on the availability of the lone pair of electrons for protonation. In the given structure (

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(A) The basicity of a nitrogen-containing compound depends on the availability of the lone pair of electrons for protonation. In the given structure (purine derivative): - Nitrogen $1$,$3$,and $4$ have lone pairs that are in $sp^2$ hybridized orbitals and are not involved in the aromatic sextet,making them available for protonation. - Nitrogen $2$ has a lone pair that is part of the aromatic system (it participates in the $6\pi$ electron delocalization required for aromaticity). - Since the lone pair on nitrogen $2$ is involved in resonance to maintain aromaticity,it is not available for donation to a proton. - Therefore,nitrogen $2$ does not contribute to the basicity of the compound.

Identify the nitrogen atom that does not contribute to the basicity of the compound shown in the structure.

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