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Question

For photochemical dimerisation of C12H14 to obtain C24H28, the proposed rate law is
d[C24H28]dt=K1K3Iabs[C12H14]K2+K3[C12H14]
where, Iabs = Intensity of absorbed light.

What will be the value of rate of formation of C24H28 if the reaction follows zero order kinetics?

A
K1
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B
K1Iabs
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C
K1K3IabsK2
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D
K1IabsK2
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Solution

The correct option is B K1Iabs
d[C24H28]dt=K1K3Iabs[C12H14]K2+K3[C12H14]=K1K3[I]absorbK2+K3=K1[I]absorb
C12H14K1K3[I]absorbK2+K3=K1[I]absorbC12H14
C12H14+C12H14K3C24H28
[B] as [C2H14] in excess

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