  We present the first high-angular resolution study of the MonR2 star-forming
complex carried out with the Submillimeter Array at (sub-)millimeter
wavelengths. We image the continuum and molecular line emission toward the
young stellar objects in MonR2 at 0.85mm and 1.3mm, with resolutions ranging
from 0.5" to ~3". While free-free emission dominates the IRS1 and IRS2
continuum, dust thermal emission prevails for IRS3 and IRS5, giving envelope
masses of ~0.1-0.3 M_Sun. IRS5 splits into at least two sub-arcsecond scale
sources, IRS5B and the more massive IRS5A. Our 12CO(2-1) images reveal 11
previously unknown molecular outflows in the MonR2 clump. Comparing these
outflows with known IR sources in the IRS5 and IRS3 subclusters allows for
tentative identification of driving stars. Line images of molecular species
such as CH3CN or CH3OH show that, besides IRS3 (a well-known hot molecular
core), IRS5 is also a chemically active source in the region. The gas
excitation temperature derived from CH3CN lines toward IRS5 is 144 \pm 15 K,
indicating a deeply embedded protostar at the hot-core evolutionary stage. SED
fitting of IRS5 gives a mass of ~7 M_Sun and a luminosity of 300 L_Sun for the
central source. The derived physical properties of the CO outflows suggest that
they contribute to the turbulent support of the MonR2 complex and to the gas
velocity dispersion in the clump's center. The detection of a large number of
CO outflows widespread across the region supports the competitive accretion
scenario as origin of the MonR2 star cluster.
