Which of the following is the strongest Brons | vedclass

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(D) Bronsted base is a substance that can accept a proton $(H^+)$. The strength of a base depends on the availability of the lone pair of electrons on

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Pyrrolidine

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(D) Bronsted base is a substance that can accept a proton $(H^+)$. The strength of a base depends on the availability of the lone pair of electrons on the nitrogen atom.$1$. In $A$ (Aniline),the lone pair on nitrogen is delocalized into the benzene ring due to resonance,making it less available for protonation.$2$. In $B$ (Diphenylamine),the lone pair is delocalized into two benzene rings,making it even less basic than aniline.$3$. In $C$ (Pyrrole),the lone pair on nitrogen is involved in the aromatic sextet (it is part of the $6\pi$ electron system),so it is not available for protonation.$4$. In $D$ (Pyrrolidine),the nitrogen atom is $sp^3$ hybridized and the lone pair is localized (not involved in resonance). This makes the lone pair readily available for donation to a proton,making it the strongest base among the given options.

Which of the following is the strongest Bronsted base?

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