duquel vs dont

Question

dont has been used like this i think or am i know totally confused?

Accepted Answer

There are verbal and prepositional phrases with "de". 
Verbal phrases are those that involve a verb, such as parler de, etc. In verbal phrases, the indirect object (what follows de) is replaced by "dont".
Je parle de mon livre. -- I'm talking about my book.Le livre dont je parle.... -- The book about which I am talking...
Prepositional phrases have a preposition (or preposition-like phrase) followed by "de". These  require duquel and its cohorts.
Je suis assis sur la table. -- I am sitting on the table.La table sur laquelle je suis assis... The table on which I am sitting...

Answer

Bonjour Carol,
To supplement Chris's answer, follow the link below for more details and explanation on 'dont' and 'duquel': using-de-qui-dont-duquel-with-prepositional-verbs-with-de
I hope this is helpful.
Bonne journée !

Answer

Thank you @Chris!  You always provide terrific explanations.