  We demonstrate that a five quark state of positive parity with an internal
P-wave structure - usually pictured as a composite of an antiquark and two
diquarks in a P-wave state - can couple to nucleons and Goldstone particles in
a chirally invariant way. The corresponding decay width is generally not
suppressed. A pentaquark of positive or negative parity with an internal S-wave
structure, which may be viewed as a composite of an antiquark and two chirally
different diquarks in an S-state, does not couple to nucleons and light mesons
in the limit of an unbroken chiral symmetry. It is stable in this limit.
However, such states can decay via the effect of the spontaneous breaking of
chiral symmetry. This breaking is strong because of the sizeable magnitude of
the quark condensate. Thus, chiral symmetry cannot be the cause of a tiny decay
amplitude, even for pentaquarks stable in a strict chiral symmetry limit.
