Decane (what is the formula?______________)

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Presentation transcript:

Decane (what is the formula?______________) Catalyst (broken clay pot or aluminium oxide (Al2O3) water

H C Decane (what is the formula?______________) What is the Structural formula - Draw in your jotter) H C

H C Decane Draw 4 isomers of decane c c c c

When we “crack” DECANE what are the possible products formed? How do you prove you have formed these products? H C H C H C c H

Annapurna

Hydrocarbons Alkanes Saturated (Single Bonds) Cycloalkanes Can be Unsaturated (Double Bond) Ethene CH2=CH2 Alkenes Pentene CH3CH2CH2CH=CH2

Saturated or Unsaturated? H C Saturated Saturated C H H C CH2 Saturated CH2CHCH3 Unsaturated Unsaturated

Breaks and bromine atoms Bromine Water Double Bonds Undergo Addition Reactions Br Br H C In Addition Reactions The double bond Breaks and bromine atoms are added to both sides of the double bond

Addition of Hydrogen (H2) The double bond Breaks and Hydrogen atoms are added to both sides of the double bond H H H C Propane Propene + Hydrogen

Now write this reactions using the Structural Formulae Alkenes into Alkanes Now write this reactions using the Structural Formulae 1. Hexene + Hydrogen Hexane C6H12 + H2 C6H14

Alkenes into Alkanes 2. Octene + Hydrogen Octane C8H16 + H2 C8H18

C4H8? Saturated? ? ? ? ? ? C2H6 C10H20 C4H10 C4H8 C8H18 C7H14 C20H42

Alkenes and Cycloalkanes Isomers from different Homologous Series Unsaturated Alkenes CnH2n C4H8 Cyclo- alkanes C4H8 Saturated

C4H8 CH2 H C Saturated Unsaturated Cyclobutane Unreactive Butene No Reaction with Bromine Butene Reacts with Bromine

C5H10 A B Pentene Cyclopentane Describe how you could find out, which test tube contained pentene and which test tube contained cyclopentane Only Tube A decolourised bromine water.

Bromine Water Alkenes react with Bromine water. The bromine water changes from brown to clear. Tube A must contain Pentene Alkene Alkane Bromine Water

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