Substitution and Addition Mechanism - Addition Reactions (9.2)

Question 1

In a nucleophilic addition reaction what takes place?

Answer 1

• a nucleophile is added to the molecules
• no other molecule is eliminated
• takes place with aldehydes and ketones

Question 2

What are the steps in nucleophilic addition reactions?

Answer 2

• nucleophile attacks
• bond breaks
• no leaving group attached to the carbon
• oxygen picks up H+ from the solvent

Question 3

Why does nucleophilic reaction occur?

Answer 3

• no good leaving group

Question 4

What occurs in electrophlic addition?

Answer 4

• small molecule added to an area of high electron electron density
• arrow goes from the substrate to the electrophile
• no molecule eliminated
• occurs in alkenes and alkynes

Question 5

In electrophilic addition, electron density attacks delta positive end. True or false?

Answer 5

True - such as in the H-BR polar molecule.

Question 6

The double bond can induce a dipole in a non-polar molecule. True or False?

Answer 6

True.

Question 7

In electrophilic addition to unsymmetrical alkenes what happens?

Answer 7

Two possible products are produced - the major and minor products.

Question 8

In electrophilic addition to symmetrical alkenes what happens? e.g. Br2

Answer 8

There is only one possible product.