For the overall reaction A + 2 B C which of the following mechanisms yields the

Question

For the overall reaction         A + 2 B C

which of the following mechanisms yields the correct overall chemical equation and is consistent with the rate equation below?

        rate = k[A][B]2

2 B I        (slow)

A + I C        (fast)

I + A C        (slow)

I + B C + A         (slow)

A + B I       (slow)

I + B C        (fast)

A + 2 B I             (fast)

I + B C + B        (slow)

1)

2 B I        (slow)

A + I C        (fast)

2)

2 B   I          (fast)

I + A C        (slow)

3)

2 A + B   I          (fast)

I + B C + A         (slow)

4)

A + B I       (slow)

I + B C        (fast)

5)

A + 2 B I             (fast)

I + B C + B        (slow)

Explanation / Answer

4. A + B --> I (slow)
I + B --> C (fast)

as the rate depends only on the slow step in this slow step involves both A and B which is in the rate equation

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