Question

For the reaction, 2NO₂ + F₂ →  2NO₂F, following mechanism has been provided.

NO₂ + F₂ + Slow → NO₂F + F

NO₂ + F + Fast → NO₂F

Thus, rate expression of the above reaction can be written as

(a) r = k [NO₂]₂[F₂]

(b) r = k [NO₂][F₂]

(c) r = k [NO₂]

(d) r = k [F₂]

Answer 1

Correct option (b) r = k [NO₂][F₂]

Explanation:

Slowest step of mechanism decides the rate expression. Thus rate = k [NO₂][F₂]