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PARALLEL REACTION: ILLUSTRATION: GENERAL TYPE (4):

Consider a parallel reaction follow first order chemical kinetics
Let t=0 concentration of (A) is [A]0 and after time (t) concentration of (A) and (B)  are [A]t and [B]t respectively .
Concentration of [B] and [C] after time t:


Percentage Yield of Product:

ILLUSTRATIVE EXAMPLE (1): An organic compound A decomposes following two parallel first order mechanisms:

Calculate the concentration ratio of C to A, if an experiment is allowed to start with only A for one hour.
SOLUTION:

ILLUSTRATIVE EXAMPLE (2): An organic compound A decomposes by following two parallel first order mechanisms:


Select the correct statement(s)
(A) If three moles of A are completely decomposed then 2 moles of B and 1 mole of C will be
formed.
(B) If three moles of A are completely decomposed then 1 moles of B and 2 mole of C will be
formed.
(C) half life for the decomposition of A is 20 min
(D) half life for the decomposition of B is 0.33 min
SOLUTION: (BC)
Generalisation of parallel reaction:

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