I would like to know when I should use "that one" in a sentence.
Is it correct to write:
I have read your two latest books: I found particularly interesting that one on ...."?
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That,this,those and these are demonstrative pronouns used to point to specific objects. There's no context to support such usage in your sentence. You speak about your personal preference, so the sentence should read
I have read your two latest books: I found particularly interesting the one on ....