The correct order of basic strength for the g | vedclass

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(D) To determine the basic strength,we analyze the availability of the lone pair on the nitrogen atom:$1$. Compound $IV$ is Guanidine. It is a very st

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$IV > III > I > II$

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(D) To determine the basic strength,we analyze the availability of the lone pair on the nitrogen atom:$1$. Compound $IV$ is Guanidine. It is a very strong base because its conjugate acid is highly stabilized by resonance involving three equivalent nitrogen atoms.$2$. Compound $I$ is Pyridine. The lone pair is in an $sp^2$ orbital,which is not involved in the aromatic sextet,making it moderately basic.$3$. Compound $III$ is Imidazole. It contains two nitrogen atoms; one has a lone pair in an $sp^2$ orbital (similar to pyridine),making it more basic than pyridine.$4$. Compound $II$ is Pyrrole. The lone pair on the nitrogen is involved in the aromatic sextet ($6\pi$ electrons),making it non-basic.Comparing these,the order of basic strength is $IV > III > I > II$.

The correct order of basic strength for the given compounds is:

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