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 Globe with Meridians

Chapter 3 - Classification Of Matter

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Atom Symbol

Chapter 1 - Models Of The Particulate Nature Of Matter

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Chapter 2 - Models Of Bonding & Structure

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Fire

Chapter 4 - What Drives Chemical Reactions?

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Rocket

Chapter 5 - How Much, How Fast & How Far?

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Test Tube

Chapter 6 - What Are The Mechanisms Of Chemical Change?

Alkenes are unsaturated organic molecules that contain a carbon&ndash;carbon double bond. &quot;Unsaturated&quot; here means that the molecule could bond with more atoms if it didn&#39;t have a double bond.

<ul>
	<li>The International Union of Pure and Applied Chemistry (IUPAC) provides rules for naming alkene molecules, similar to the ones for alkanes.</li>
	<li>The names of alkenes end with the suffix &quot;-ene,&quot; whereas the names of alkanes end with &quot;-ane.&quot;</li>
</ul>

<ul>
	<li>Identify the longest continuous carbon chain that includes the carbon&ndash;carbon double bond. This will be the parent chain.</li>
	<li>Number the carbons in the chain in such a way that the carbon&ndash;carbon double bond gets the lowest possible number (lowest locant). This priority takes precedence over any substituents in the molecule.</li>
	<li>Identify and name the substituents (side chains). In our example, there&#39;s a methyl (&ndash;CH3) substituent.</li>
	<li>Write the name of the molecule, including the substituents, with their position numbers, followed by the name of the parent chain with the &quot;-ene&quot; suffix.</li>
</ul>

Imagine a compound with 6 carbon atoms in a row, with a carbon&ndash;carbon double bond between the 2nd and 3rd carbons, and a methyl (&ndash;CH3) side chain attached to the 4th carbon.

Following the steps:

<ul>
	<li>The longest chain has 6 carbons, so it&#39;s a hexene (hex- for 6, -ene for alkene).</li>
	<li>We number from left to right to give the double bond the lowest locant, making it between carbons 2 and 3.</li>
	<li>The methyl substituent is on the 4th carbon.</li>
	<li>Combining these, the name of the molecule is 4-methyl-2-hexene.</li>
</ul>

Alkenes are abundant in nature and have practical uses. For instance, ethene (C2H4), a simple alkene with two carbons and a double bond between them, is used in the production of polyethylene - a common plastic. When you drink from a plastic water bottle or use a plastic shopping bag, you&#39;re using products made from polymers derived from alkenes!

The term &quot;unsaturated&quot; comes from the idea that the molecule can &quot;saturate&quot; itself by breaking the double bond and adding more atoms. In contrast, alkanes are &quot;saturated&quot; because they can&#39;t hold any more atoms.

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Remember, practice makes perfect. Try naming some alkenes on your own and you&#39;ll get the hang of it in no time!

Chapter 3 - Classification Of Matter

Unlocking Alkene Naming: Dive Into IUPAC Rules!

Table of content

What are alkenes?

Naming rules for alkenes

Steps to name alkenes

Unlock the Full Content!

Chapter 3 - Classification Of Matter

Unlocking Alkene Naming: Dive Into IUPAC Rules!

Table of content

What are alkenes?

Naming rules for alkenes

Steps to name alkenes

Unlock the Full Content!