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(A) The basic strength of amines depends on the availability of the lone pair of electrons on the nitrogen atom for protonation.$(II)$ Pyrrole: The lo

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$II < I < IV < III$

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(A) The basic strength of amines depends on the availability of the lone pair of electrons on the nitrogen atom for protonation.$(II)$ Pyrrole: The lone pair on nitrogen is involved in the aromatic sextet,making it non-basic.$(I)$ Aniline: The lone pair on nitrogen is delocalized into the benzene ring due to resonance,reducing its availability for protonation.$(IV)$ Cyclohexylamine: This is a primary aliphatic amine. The lone pair is localized on the nitrogen atom,making it more basic than aniline.$(III)$ $N$-Methylpiperidine: This is a tertiary aliphatic amine. It is more basic than primary aliphatic amines due to the electron-donating inductive effect $(+I)$ of the alkyl groups,which increases the electron density on the nitrogen atom.Therefore,the increasing order of basic strength is: $II < I < IV < III$.

Among the following compounds,the increasing order of their basic strength is

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