hello : actually pka of these acidics  unvailable . you can calculate pka from the pH values . 

pKa of  1-Adamantane Carboxylic Acid in BmimNTf2 is 17.0. see: J. Org. Chem. 2013, 78, 12487−12493

Just use a software package to calculate the pKa values. It should give you an idea of the relative strengths of the acids. Pretty sure that Scifinder has one built in.

By first principles and through bond inductive effects, 2,2-dicyclohexylacetic acid and 2-hexyldecanoic acid will have a similar pKa of about 4.8. Presumably 1-Adamantane carboxylic acid would have a higher pKa of ~4.9-5.0

if u have pH of the following acids, u can calculate pKa values of them using Hasselsen Handerbalch equation pH= pKa + log [conjugate base]/[conjugate acid]

You can calculate the pKa values using ChemAxon Package or estimating the value by the following way:

Normaly, the pKa of organic acids in a homologous series of superior members tends to a constant value.

Yes, I agree that ChemAxon could be a suitable package in order to get a guess of pKa values for any compound.

You can calculate it with quantum chemistry software yourself. Here is the detials,

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