  In current and future surveys, quasars play a key role. The new data will
extend our knowledge of the Universe as it will be used to better constrain the
cosmological model at redshift $z>1$ via baryon acoustic oscillation and
redshift space distortion measurements. Here, we present the first clustering
study of quasars observed by the extended Baryon Oscillation Spectroscopic
Survey. We measure the clustering of $\sim 70,000$ quasars located in the
redshift range $0.9<z<2.2$ that cover 1,168 deg$^2$. We model the clustering
and produce high-fidelity quasar mock catalogues based on the BigMultiDark
Planck simulation. Thus, we use a modified (Sub)Halo Abundance Matching model
to account for the specificities of the halo population hosting quasars. We
find that quasars are hosted by halos with masses $\sim10^{12.7}M_\odot$ and
their bias evolves from 1.54 ($z=1.06$) to 3.15 ($z=1.98$). Using the current
eBOSS data, we cannot distinguish between models with different fractions of
satellites. The high-fidelity mock light-cones, including properties of halos
hosting quasars, are made publicly available.
