Classify each transformation as substitution, elimination,...

Key Concepts

Addition Reaction

An addition reaction involves the process whereby atoms or groups are added to a molecule that contains a carbon–carbon multiple bond. This reaction type results in the saturation of the bond and is fundamental in various synthesis applications, particularly in polymer chemistry and organic synthesis.

Substitution Reaction

A substitution reaction involves the replacement of one atom or group in a molecule with a different atom or group. It is a common mechanism in organic chemistry where a functional group is swapped out, often involving nucleophilic or electrophilic reagents.

Reaction Classification

Reaction classification is the process of categorizing chemical reactions based on the changes that occur in the reactants, such as the replacement of groups, removal of atoms, or addition of atoms to double or triple bonds. This categorization helps chemists understand the mechanism and predict the outcomes of reactions.

Elimination Reaction

An elimination reaction is characterized by the removal of atoms or groups from a molecule, leading to the formation of a double or triple bond. This process typically results in the loss of a small molecule, such as water or a halide ion, and is key in synthesizing unsaturated compounds.

Transcript

00:05 So in this first reaction, you can see that there's a cyclohexane, and this cyclohexane is attached to an alcohol group.

00:13 And then after the reaction takes place, this alcohol group has been replaced by a bromine group.

00:19 So any time that a sigma bond is broken and a molecule is replaced by another molecule and a new sigma bond is formed, then a substitution reaction takes place.

00:30 So in this case, this will be a substitution.

00:38 Because a sigma bond is broken and one molecule, which is in this case the phenyl, or the alcohol, sorry, has been replaced by a new molecule, which is the bromine and a new sigma bond has been formed.

00:51 In part b of this question, you can see that originally there is a cyclohexane that has formed a double bond with oxygen, forming a ketone functional group.

01:03 And then after the reaction, you have the cyclohexane, but instead of there being a pi bond, there are two sigma bonds, and the cyclohexane is attached to a hydrogen and an alcohol group.

01:17 So in this case, this is an addition reaction, because in an addition reaction, what happens is that a double bond is going to be replaced or a pie bond is going to be replaced by two sigma bonds because there is going to be an additional bond.

01:33 Addition of two new molecules.

01:36 So anytime that you see a pie bond or a double bond in the reactant side and then in the product side you see two single bonds, then you know immediately that an addition has addition reaction has taken place in this case.

01:56 So in part c, as you can see, originally in the reacting side, you're going to have carbon and it's bound to three hydrogens and then in the product side you have that same carbon and now it's bound to two hydrogens and instead of that additional hydrogen it's been replaced by chlorine so you can see that since a hydrogen bond has been replaced by a chlorine bond clearly a substitution has been taken place and you can tell immediately that a sigma bond which was originally here between the carbon and hydrogen was broken the hydrogen left and the new sigma bond was formed between carbon and chlorine and so a substitution reaction has been taking place here.

02:48 And then in the last part, part d of this problem.

02:52 So when a molecule is written in a condensed form, i think it helps when you're originally learning to write it out in a structural form and see what the whole molecule looks like...

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