1. Chapitre 1

2. Chapitre 2

Annexes
    A
    B
    C

documentclass{book}


usepackage[toc]{appendix}


begin{document}
tableofcontents
chapter{Foo}
chapter{Foobar}

begin{appendices}
  chapter{Foo App}
  chapter{Foobar App}
end{appendices}

end{document}