MediumChemistryHigh School (11–12)Organic Chemistry: Some Basic Principles and Techniques › Electronic Effects and Reaction IntermediatesConceptualA-LevelIBJEE Main
Name the type of each reaction, and give the evidence…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Name the type of each reaction, and give the evidence.
- on heating with a catalyst
Need a reminder? The key ideaShow
A nucleophile is electron-rich and gives a pair. An electrophile is electron-poor and takes one. There are four types of reaction. Substitution replaces a group, with two molecules in and two out. Addition joins two molecules into one and uses up a pi bond. Elimination removes a small molecule and makes a pi bond. Rearrangement moves atoms inside one molecule. When counting bonds, a double bond holds one sigma bond and one pi bond.
The worked solution
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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
(a) Substitution. Two molecules go in and two come out. OH replaces Br.
(b) Addition. Two molecules join into one, and the pi bond is used up.
(c) Elimination. One molecule gives two small pieces in place of one, and a pi bond forms.
(d) Rearrangement. One molecule becomes an isomer. The double bond moves to a new position, and nothing is added or lost.
Answer: (a) substitution, (b) addition, (c) elimination, (d) rearrangement.
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