In the gas phase reactions A$+$B$->$D and A$+$B$->$U$,$ D is the desired product and U is the undesirable product.

Low selectivity towards the undesirable product U is achieved by increasing the B concentration and temperature as well as keeping the A concentration quite low.

The reaction rate parameter sets given below belong to reactions in which the desired product and undesirable products are produced, respectively.

a$)$ Decide which reaction rate expression belongs to the desired product $($D$)$ and which one belongs to the undesirable product $($U$)?$

b$)$ Explain the temperature, concentration and reactor type strategies that should be preferred to obtain high selectivity for product D$.$

set $12345678910$

E$($cal$/$mol$.$k$)700400700400700400700400700400$

$\backslash$alpha $0\mathrm{.}51\mathrm{.}01\mathrm{.}51\mathrm{.}01\mathrm{.}50\mathrm{.}51\mathrm{.}01\mathrm{.}51\mathrm{.}00\mathrm{.}5$

$\backslash$beta $1\mathrm{.}51\mathrm{.}50\mathrm{.}50\mathrm{.}51\mathrm{.}01\mathrm{.}01\mathrm{.}50\mathrm{.}50\mathrm{.}50\mathrm{.}5$