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The reason that I believe must be the difference in the amount of hydrogen bonding formed by both of the compounds in the liquid .

But I suspected that both must be having same amount of hydrogen bonding because:

As nitrogen atom has only one lone pair so it can form hydrogen bond with only one H atom of other molecule the presence of two attached hydrogens to nitrogen atom in the cyclohexanamine should not make a difference compared to piperidine , since both should be having same amount of hydrogen bonding.

But actually there is a difference so please tell me why

Also do correct me wherever I am wrong conceptually.

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  • $\begingroup$ What you have forgot is these two compounds have molar mass difference as well (extra $\ce{CH2}$). That make the biggest reason since both are amines and H-bonding is a common factor. Easy comparison would have been benzene versus toluene. $\endgroup$ – Mathew Mahindaratne May 4 '20 at 8:26

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