The $^{12}$C${(\mathrm{}}^{10}$B,p${)}^{21}$Ne reaction has been investigated at an incident energy of 20 MeV. Complete angular distributions were measured in the angular range ${\ensuremath{\theta}}_{\mathrm{lab}=7.5\mathrm{\ifmmode^\circ\else\textdegree\fi{}}--161.25\mathrm{\ifmmode^\circ\else\textdegree\fi{}}}$ using a multiangle spectrograph. Angular distributions for states in $^{21}\mathrm{Ne}$ up to 6.75 MeV excitation are found to be symmetric around 90\ifmmode^\circ\else\textdegree\fi{}. Results have been analyzed in terms of Hauser-Feshbach compound-nucleus calculations. A simple analysis of the angle-integrated cross sections versus (2J+1) shows that the (2J+1) rule holds for states with angular momenta up to (7/2). States with higher J are significantly enhanced due to kinematical conditions. The Hauser-Feshbach calculations account fairly well for the high-J enhancement of ${\ensuremath{\sigma}}_{\mathrm{tot}}$.