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We investigate the decays of $\bar{B}^0_s$, $\bar{B}^0$ and $B^-$ into$\eta_c$ plus a scalar meson in a theoretical framework by taking into accountthe dominant process for the weak decay of $\bar{B}$ meson into $\eta_c$ and a$q\bar{q}$ pair. After hadronization of this $q\bar{q}$ component into pairs ofpseudoscalar mesons we obtain certain weights for the pseudoscalarmeson-pseudoscalar meson components. The calculation is based on thepostulation that the scalar mesons $f_0(500)$, $f_0(980)$ and $a_0(980)$ aredynamically generated states from the pseudoscalar meson-pseudoscalar mesoninteractions in $S$-wave. Up to a global normalization factor, the $\pi \pi$,$K \bar{K}$ and $\pi \eta$ invariant mass distributions for the decays of $\barB^0_s \to \eta_c \pi^+ \pi^-$, $\bar{B}^0_s \to \eta_c K^+ K^-$, $\bar B^0 \to\eta_c \pi^+ \pi^-$, $\bar{B}^0 \to \eta_c K^+ K^-$, $\bar{B}^0 \to \eta_c\pi^0 \eta$, $B^- \to \eta_c K^0 K^-$ and $B^- \to \eta_c \pi^- \eta$ arepredicted. Comparison is made with the limited experimental informationavailable and other theoretical calcualtions. Further comparison of theseresults with coming LHCb measurements will be very valuable to make progress inour understanding of the nature of the low lying scalar mesons, $f_0(500),f_0(980)$ and $a_0(980)$.

$\bar{B}^0$, $\bar{B}^0_s$ and $B^-$ decays into $\eta_c$ plus a scalar meson