  We introduce and study a new class of homotopy spheres called Farrell-Jones
spheres. Using Farrell-Jones sphere we construct examples of closed negatively
curved manifolds $M^{2n}$, where $n=7$ or $8$, which are homeomorphic but not
diffeomorphic to complex hyperbolic manifolds, thereby giving a partial answer
to a question raised by C.S. Aravinda and F.T. Farrell. We show that every
exotic sphere not bounding a spin manifold (Hitchin sphere) is a Farrell-Jones
sphere. We also discuss the relationship between inertia groups of
$\mathbb{C}\mathbb{P}^n$ and Farrell-Jones spheres.
