The following parallel reactions occur in a flow reactor.

$AB.,-r_{1A}=k_1$

$AC,-r_{2A}=k_2{C}_A$

$k_1=2mo\frac{l}{L}*min$

$k_2=1mi{n}^{-1}$

$C_{A0}=4mo\frac{l}{L}$

a$.$ What is the instantaneous selectivity of $B$ to $C(S_{\frac{B}{C}})?$

b$.$ What is the instantaneous yield of $B(Y_B)$

c$.$ If the reaction occurs in a CSTR with a conversion of $90\%,$ what is

a$.$ The space time of the reactor, $?$

b$.$ The overall selectivity of B to C $(tilde(S{)}_{\frac{B}{C}})?$

c$.$ The overall yield of B$,$ tilde$(Y{)}_B?$

d$.$ If the reaction occurs in a PFR with a conversion of $90\%,$ what is

a$.$ The space time of the reactor, $?$

b$.$ The overall selectivity of B to C $(tilde(S{)}_{\frac{B}{C}})?$

c$.$ The overall yield of B$,$ tilde$(Y{)}_B?$