How to Answer Mechanism and Reaction Problem

How to Answer Mechanism and Reaction Problem - How to...

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How to Answer a “Show the Mechanism” Question and a “Complete the Reaction” Question Show the Mechanism Questions It is common on organic chemistry exams to have a question that begins something like this: Show the step-by-step mechanism of the reaction of ……. . Such questions are referred to as mechanism questions and should be answered in a specific way. Below is an example of a mechanism and a description of how it should be answered. Question: Show the detailed mechanism of the reaction of t -butyl bromide with water to form the ether product. Use curved arrow notation and be sure to show any protonation or deprotonation steps that might occur. (See page 252-253 of your text) Step 1 – Write out the equation for the reaction using structural formulas. Step 2 – Use curved arrow notation to show each step of the mechanism. Make sure to draw arrows from electrons to atoms to show bond formation or from bonds to atoms to show the breaking of bonds. Never draw a curved arrow toward an unshared electron pair. Be sure to show charges where present. CH 3 C CH 3 CH 3 Br + O HH CH 3 C CH 3 CH 3 OH + HBr CH 3 C CH 3 CH 3 Br CH 3 C CH 3 CH 3 + Br O H H CH 3 C CH 3 CH 3 O H H H O H CH 3 C CH 3 CH 3 OH H 3 O + Br (HBr in H 2 O)
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How to Answer Mechanism and Reaction Problem - How to...

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