How to determine slow step?

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Antonio Melgoza 2K
Posts: 33
Joined: Fri Sep 25, 2015 3:00 am

How to determine slow step?

Postby Antonio Melgoza 2K » Tue Feb 23, 2016 11:04 pm

How would you be able to identify the slow step in an electrophilic addition reaction?

Christine Van 2E
Posts: 47
Joined: Fri Sep 25, 2015 3:00 am

Re: How to determine slow step?

Postby Christine Van 2E » Tue Feb 23, 2016 11:24 pm

Hi!

In the electrophilic addition reaction, the slow step is the first step because you have to break 2 bonds (H-Br and C=C), which requires energy and form only 1 bond (C-H), which releases energy. Step 2 only forms 1 bond (C-Br), which also releases energy. Since you break more bonds than forming in the first step, it will require more energy to make that reaction occur; thus it has the higher activation energy and is the rate-determining/ slow step.

Hope that helps!


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