SK025 Chapter 5 Hydrocarbons


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In this chapter, you will learn about alkane and alkene. Alkane is a saturated hydrocarbon, thus less reactive than alkene, which is un saturated hydrocarbon.

For self reflection, if you can answer the following questions, you are at a good condition.

Alkane

1. Why alkane can ONLY carry out free radical substitution?
2. What is the function of UV in halogenation of alkane.
3. How to identity major and minor product of halogenation of alkane
4. Differentiate the products of combustion at different conditions.

A here, is the summary for physical and chemical properties of alkane.



To have better understanding of halogenation of haloalkane, please understand the mechanism.
In the first video, you will understand the three steps in the mechanism of simple alkane.



In the second video, i duscuss the mechanism of halogenation of cycloalkane using cyclohexane. You need to be familiar with drawing technique.

  

The last video, discuss more complex alkane, which produce major and minor product of halogentation.

  

Alkene

There are two ways to prepare alkene, either from alcohol or haloalkane via elimination reaction. This reaction must follow Saytzeff's rule (what it is about?) To understand the elimination reaction, please watch the following video, regrading to dehydration of alcohol to produce alkene. Please consider rearrangement of carbocation in elimination reaction.



Alkene is a reactive hydrocarbon (why), it can carry out various electrophilic addition. This reaction follow Marconikov's (what it is about?) 

Mechanism hydration of alkene



Mechanism hydrohalogenation of alkene



Okey..thats all...see you again in next chapter

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