In sets A - D, only one of the sets is incorr | vedclass

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(C) The basic strength of amines depends on the availability of the lone pair of electrons on the nitrogen atom. In option $A$, the order is correct:

Vedclass · Accepted Answer

$	ext{Pyrrole} > 	ext{Pyrrolidine} > 	ext{Pyrazole}$

Vedclass · Answer

(C) The basic strength of amines depends on the availability of the lone pair of electrons on the nitrogen atom. In option $A$, the order is correct: diphenylamine is less basic than aniline due to two phenyl groups, and cyclohexylamine is the most basic as its lone pair is not involved in resonance. In option $B$, the order is correct: pyrrole is the least basic because its lone pair is involved in the aromatic sextet, pyridine is more basic, and piperidine is the most basic as it is a saturated cyclic amine. In option $C$, the order is incorrect. The correct order of basicity is $	ext{Pyrrolidine} > 	ext{Pyrazole} > 	ext{Pyrrole}$. Pyrrolidine is a secondary aliphatic amine (most basic), pyrazole has a lone pair available for protonation, and pyrrole is the least basic. In option $D$, the order is correct: the $-NO_2$ group is electron-withdrawing (decreases basicity), while the $-CH_3$ group is electron-donating (increases basicity). Therefore, the incorrect set is $C$.

In sets $A - D$, only one of the sets is incorrect regarding basic strength. Select it.

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