$1)$ In the flow reactor, irreversible, reversible heat generation, reversible endothermic reactions, for each case, the correlation graph of T$,$ XA$,$ and $-$rA is well characterized, and the operating line for the minimum temperature progression is shown.

$2)$ In the case of a flow reactor, the temperature, T and conversion rate, and the relationship between XA are adiabatic

Find from the energy balance in the condition of operation$).$

$3)$ Explain how to obtain the reactor volume of PFR and MFR if the endothermic reaction is operated under adiabatic conditions.

$4)$ For each of the endothermic and exothermic reactions, explain how to determine the optimal reactant introduction temperature $($the best adiabatic operation$)$ in adiabatic operation.

$5)$ For each of the endothermic and exothermic reactions, explain which reactor type is optimal for adiabatic operation.