FUNCHEM 25 - Alkenes

Question 1

What are the different types of Alkenes?

Answer 1

2 double bonds –> diene
3 double bonds –> triene
4 or more –> polyene

Question 2

What types of reactions can alkenes undergo?

Answer 2

Addition and elimination reactions.

Question 3

Define Electrophilic Addition Reaction.

Answer 3

An Electrophilic Addition Reaction is a reaction in which the rate determining step involves the addition of an electrophile, which is an electron seeking species.

Question 4

What is a carbocation?

Answer 4

A carboncation is highly reactive, contains a positive carbon atom, and is trigonal planar. Carbocations in order of stability from most to least:

1. Tertiary (C+ is attached to three other carbons)
2. Secondary (C+ is attached to two other carbons)
3. Primary (C+ is attached to one other carbon)

Question 5

What is Markovnikov’s Rule

Answer 5

In the case of the addition of a halide to an unsymmetrical alkene, the hydrogen is added to the carbon with more hydrogens, to form a more stable carbocation in the intermediate step.