Explanation
In piperidine nitrogen atom is SP3 hybridized which has a less S – character while in pyridine Nitrogen atom is SP2 hybridized which has more S – character. Therefore held by the nitrogen nucleus in pyridine which has more S – character. In piperidine ione pair of electrons are less tightly held and are easily available for protonation therefore piperidine is a stronger base than pyridine.
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