For the first-order parallel reactions, starting with 1 M of A, which of the following statement(s) is/are correct? A --(3K)-- B; A --(2K)-- 2C; A --(K)-- 3D

Question

For the first-order parallel reactions, starting with 1 M of A, which of the following statement(s) is/are correct? A --(3K)--> B; A --(2K)--> 2C; A --(K)--> 3D

Prashant Kotian · Accepted Answer

Correct answer: A,B,C. Rates of formation: rB = 3K[A], rC = 4K[A], rD = 3K[A]. Ratios are constant (3:4:3) over time, meaning [C]t > [B]t = [D]t. Total consumption rate = 6K[A]. Fraction of A forming C = 2K/6K = 1/3. 1 mole A yields 2 moles C, so max [C] = 2 × (1/3) = 2/3 M ≈ 0.67 M. Therefore, correct answer is A,B,C.

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