Organic Chemistry

Check Also in Elimination Reactions:

Practice

1.

What happens to the rate of the E1 reaction under each of the following changes in the concentration of the substrate (RX) and the base?

a) [Base] is doubled, and [R-X] stays the same.
b) [Base] stays the same, and [R-X] is doubled.
c) [Base] is doubled, and [R-X] is halved.
d) [R-X] is tripled, and [Base] is halved.

a)
Check your answers

a) [Base] is doubled, and [R-X] stays the same.

In order to determine how the rate will change, we need to write the correct rate law equation for the E1 mechanism:


E1 is a unimolecular mechanism and the rate depends only on the concentration of the substrate (R-X), as the loss of the leaving group is the rate determining step for this unimolecular reaction.

So, when [Base] is doubled, and [R-X] stays the same, the rate will stay the same as well since the reaction is first order in R-X and the concentration of the base does not affect the rate.

b)
Check your answers

 

b) [Base] stays the same, and [R-X] is doubled.

As mentioned above, the rate is changed depending only on the concentration of the R-X. So, in this case, the rate will double.

c)
Check your answers
This content is for registered users only. Click here to Register! By joining Chemistry Steps, you will gain an instant access to the answers and solutions for All the practice problems including over 13 hours of problem-solving videos. If you are already registered, upgrade your subscription to CS Prime under your account settings.
d)
Check your answers
This content is for registered users only. Click here to Register! By joining Chemistry Steps, you will gain an instant access to the answers and solutions for All the practice problems including over 13 hours of problem-solving videos. If you are already registered, upgrade your subscription to CS Prime under your account settings.
2.

Classify the following carbocations from the least to most stable:

Check your answers

3.

Identify which of the following compounds will, under appropriate conditions, undergo an E1 reaction and arrange them from the least to most reactive in E1 reactions:

Check your answers
This content is for registered users only. Click here to Register! By joining Chemistry Steps, you will gain an instant access to the answers and solutions for All the practice problems including over 13 hours of problem-solving videos. If you are already registered, upgrade your subscription to CS Prime under your account settings.
4.

Draw the structure of carbocation intermediates forming upon ionization. Where possible, include resonance structures and rearrangements:

Check your answers
This content is for registered users only. Click here to Register! By joining Chemistry Steps, you will gain an instant access to the answers and solutions for All the practice problems including over 13 hours of problem-solving videos. If you are already registered, upgrade your subscription to CS Prime under your account settings.
5.

Draw the curved arrow mechanism for each E1 reaction:

Check your answers
This content is for registered users only. Click here to Register! By joining Chemistry Steps, you will gain an instant access to the answers and solutions for All the practice problems including over 13 hours of problem-solving videos. If you are already registered, upgrade your subscription to CS Prime under your account settings.
Solution
This content is for registered users only. Click here to Register! By joining Chemistry Steps, you will gain an instant access to the answers and solutions for All the practice problems including over 13 hours of problem-solving videos. If you are already registered, upgrade your subscription to CS Prime under your account settings.
6.

The following alkyl halide gives several different products when heated in ethanol. Draw curved arrow mechanisms to explain how the following four products are formed:

Check your answers
This content is for registered users only. Click here to Register! By joining Chemistry Steps, you will gain an instant access to the answers and solutions for All the practice problems including over 13 hours of problem-solving videos. If you are already registered, upgrade your subscription to CS Prime under your account settings.
7.

Propose a structure of at least one alkyl halide that will form the following major products by E1 mechanism:

 

Check your answers
This content is for registered users only. Click here to Register! By joining Chemistry Steps, you will gain an instant access to the answers and solutions for All the practice problems including over 13 hours of problem-solving videos. If you are already registered, upgrade your subscription to CS Prime under your account settings.
Solution
This content is for registered users only. Click here to Register! By joining Chemistry Steps, you will gain an instant access to the answers and solutions for All the practice problems including over 13 hours of problem-solving videos. If you are already registered, upgrade your subscription to CS Prime under your account settings.

Leave a Comment

×

Buy the Chemistry Study Guides and get 30% off for signing up to Chemistry Steps Prime! Check this out!