chemistry-class-11-unit-13-chapter-03-hydrocarbons-l-3-8-o0l-yz4jmj4

### <Success style="font-size:25px"> Hydrocarbons L-3 </Success>
### <primary style="font-size:24px"> Alkene </primary>
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- Alkenes are unsaturated hydrocarbons containing at least one double bond

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<footer style = "font-size: 18px"> $\rightarrow$ Hydrocarbons $\rightarrow$ <span style = "color:blue"> Alkene </span> $\rightarrow$ Nomenclature $\rightarrow$ Nomenclature </footer>

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### <primary style="font-size:24px"> Nomenclature </primary>
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- The longest chain of carbon atoms containing the double bond is selected
- Numbering of the chain is done from the end which is nearer to the double bond
- The suffix ‘ene’ replaces ‘ane’ of alkanes

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<footer style = "font-size: 18px">Hydrocarbons $\rightarrow$ Alkene $\rightarrow$ <span style = "color:blue"> Nomenclature </span> $\rightarrow$ Nomenclature $\rightarrow$ Isomerism </footer>

### <Success style="font-size:25px"> Hydrocarbons L-3 </Success>
### <primary style="font-size:24px"> Nomenclature </primary>
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![image](https://temp-public-img-folder.s3.ap-south-1.amazonaws.com/sathee.prutor.images/subject-images/iitpal/image/chemistry-class-11-unit-13-chapter-03-hydrocarbons-l-3_8-o0l-yz4jmj4-206(r).jpg)
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<footer style = "font-size: 18px">Alkene $\rightarrow$ Nomenclature $\rightarrow$ <span style = "color:blue"> Nomenclature </span> $\rightarrow$ Isomerism $\rightarrow$ Preparation </footer>

### <Success style="font-size:25px"> Hydrocarbons L-3 </Success>
### <primary style="font-size:24px"> Isomerism </primary>
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- Alkenes show both structural isomerism and geometrical isomerism
 - Structural isomerism
 - ethene $(C_2H_4)$ and propene $(C_3H_6)$ can have only one structure but alkenes higher than propene have different structures
 - Geometrical isomerism
 - Two or more compounds with the same number and types of atoms, and bonds, but which have different geometries for the atoms

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<footer style = "font-size: 18px">Nomenclature $\rightarrow$ Nomenclature $\rightarrow$ <span style = "color:blue"> Isomerism </span> $\rightarrow$ Preparation $\rightarrow$ Dehydration of alcohols </footer>

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### <primary style="font-size:24px"> Preparation </primary>
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- **Dehydration of alcohols**

- $3^\circ > 2^\circ > 1^\circ$

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<footer style = "font-size: 18px">Nomenclature $\rightarrow$ Isomerism $\rightarrow$ <span style = "color:blue"> Preparation </span> $\rightarrow$ Dehydration of alcohols $\rightarrow$ Dehydrohalogenation </footer>

### <Success style="font-size:25px"> Hydrocarbons L-3 </Success>
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- Mechanism

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<footer style = "font-size: 18px">Isomerism $\rightarrow$ Preparation $\rightarrow$ <span style = "color:blue"> Dehydration of alcohols </span> $\rightarrow$ Dehydrohalogenation $\rightarrow$ Hydrogenation </footer>

### <Success style="font-size:25px"> Hydrocarbons L-3 </Success>
### <primary style="font-size:24px"> Dehydrohalogenation </primary>
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<footer style = "font-size: 18px">Preparation $\rightarrow$ Dehydration of alcohols $\rightarrow$ <span style = "color:blue"> Dehydrohalogenation </span> $\rightarrow$ Hydrogenation $\rightarrow$ Hydrogenation </footer>

### <Success style="font-size:25px"> Hydrocarbons L-3 </Success>
### <primary style="font-size:24px"> Hydrogenation </primary>
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<footer style = "font-size: 18px">Dehydrohalogenation $\rightarrow$ Hydrogenation $\rightarrow$ <span style = "color:blue"> Hydrogenation </span> $\rightarrow$ Cracking $\rightarrow$ Physical properties </footer>