Chemical Reaction Engineering
In the hydrodealkylation of toluene to benzene, the following reactions occur:C₇H₈ + H₂ → C₆H₆ + CH₄2C₆H₆ ⇋ C₁₂H₁₀ + H₂Toluene and hydrogen are fed to a reactor in a molar ratio 1:5.80% of the toluene gets converted and the selectivity of benzene(defined as moles of benzene formed/moles of toluene converted) is 90%. The fractional conversion of hydrogen is

0.136
0.16
0.152
0.144

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Chemical Reaction Engineering
The rate of the heterogenous catalytic reaction A(g) + B(g) ? C(g) is given by -rA = k.KA.pA.PB/(1 + KA.PA + Kc.pc), where KA and Kc are the adsorption equilibrium constants. The rate controlling step for this reaction isA. absorption of A.

Surface reaction between absorbed A and absorbed B
Surface reaction between absorbed A and B in the gas phase
Absorption of A
Surface reaction between A in the gas phase and absorbed B

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Chemical Reaction Engineering
Semibatch reactor is preferred, when a/an

Undersirable side reaction (at high concentration of one of the reactants) is to be avoided
All of these
A gas is to be reacted with liquid (e.g. hydrogenation of fat)
A highly exothermic reaction is to be controlled

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