The correct order of basic strength is:

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(A) To determine the basic strength,we look at the availability of the lone pair on the nitrogen atom:$1$. In $Piperidine$,the nitrogen atom is $sp^3$

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Piperidine > Pyridine > Pyrrole

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(A) To determine the basic strength,we look at the availability of the lone pair on the nitrogen atom:$1$. In $Piperidine$,the nitrogen atom is $sp^3$ hybridized and its lone pair is localized,making it the most basic.$2$. In $Pyridine$,the nitrogen atom is $sp^2$ hybridized. The lone pair is in an $sp^2$ orbital,which is more electronegative than an $sp^3$ orbital,making it less basic than $Piperidine$.$3$. In $Pyrrole$,the lone pair on the nitrogen atom is involved in the aromatic sextet (delocalized). Therefore,it is not available for protonation,making it the least basic.Thus,the correct order of basic strength is $Piperidine > Pyridine > Pyrrole$.

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