The choices below are some of the proposed steps of a reaction mechanism.
Which step is least likely to be the rate-determining step of the mechanism?

J + K \to J K

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2 J K + 4 L \to 2 J L + 2 K L

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K L + M N \to K M + M L

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2 K M \to K_{2} + 2 M

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Solution

The correct option is C $J + K \to J K$
$\to$ First option is least rate determining step because in this bond formation takes place which is fast and exothermic step. Bond breaking is slow step while bond formation is fast step.

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