Alkenes

Level 2 Organic

Are alkenes soluble in water?

Alkenes are soluble in water.

How are the melting & boiling points of alkenes?

Melting and boiling points of alkenes gradually increase as molar mass increases.

How reactive are alkenes?

As alkenes are unsaturated due to their carbon-carbon double bond, molecules are quite reactive.

What are the three reactions of alkenes?

• Addition

• Oxidation

• Polymerisation

What reagent is involved with the addition reaction where an alkene is turned into an haloalkane with two bromines?

Br₂

What reagent is involved with the addition reaction where an alkene is turned into an haloalkane with two chlorine?

Cl₂

What is observed when an alkene is added to bromine solution?

The colour rapidly disappears and bromine is decolourised. The solution goes from orange to colourless. (FASTER THAN ALKANE)

What is observed when an alkene is added to chlorine solution?

There is no colour change in this reaction.

What reagent is involved with the addition reaction where an alkene is turned into an alkane?

H2, alongside Ni or Pt catalyst (with a heat of around 150 degrees.)

What reagent is involved with the addition reaction where an alkene is turned into a haloalkane with one Br?

HBr

What reagent is involved with the addition reaction where an alkene is turned into a haloalkane with one chlorine?

HCl

A major product is formed when:

The H of HCl/HBr is added to the carbon with the most H atoms already. Rich get richer.

What reagent is involved with the addition reaction where an alkene is turned into an alcohol?

H⁺/H20 and heat, or dil. H2SO4 and heat

What is the oxidising agent that oxidises an alkene into a diol?

MnO4- or H⁺/MnO4-

What is the reaction called when alkene monomer molecules join together many times?

Addition polymerisation.