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A Level Organic Chemistry > Alkenes > Flashcards

Alkenes Flashcards

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1
Q

State the reaction, reagents, and conditions for:

Ethene + Br2

A

Reaction: Electrophilic Addition
Reagents and conditions: Br2 in CCl4, room temp, in the dark
Observation: Decolourisation of orange-red solution

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2
Q

State the reaction, reagents, and conditions for:

Ethene + HBr

A

Reaction: Electrophilic Addition

Reagents and conditions: Dry HBr/ HBr in CCl4, room temperature

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3
Q

State the reaction, reagents, and conditions for:

Ethene + H2O

A

Reaction: Electrophilic Addition
Reagents and conditions:
1. Concentrated H2SO4, followed by boiling/heating with water (Lab)
2. Heat at high pressure with concentrated H3PO4 as catalyst (Industrial)

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4
Q

State the reaction, reagents, and conditions for:

Ethene + H2

A

Reaction: Reduction
Reagents and conditions: H2 gas in nickel catalyst in the presence of high temperature and high pressure or
Pd/Pt catalyst at room temp
Observation: Decrease in pressure

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5
Q

State the reagents, and conditions for:

Mild Oxidation

A

Reagents and conditions: Cold alkaline KMnO4

Observation: Decolourisation of purple KMnO4 solution and formation of brown precipitate of MnO4

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6
Q

State the reagents, and conditions for:

Strong Oxidation

A

Reagents and Conditions:
Hot acidified KMnO4 or hot KMnO4, dilute H2SO4 or hot alkaline KMnO4
Observation: Decolourisation of purple KMnO4 solution
(and effervescence of CO2 only if terminal alkene is present)

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7
Q

Describe chemical test for alkenes

A
  1. Add cold alkaline potassium manganate (VII) solution
    Observation: Decolourisation of purple KMnO4 solution and brown ppt of MnO2
  2. Add acidified potassium manganate (VII) solution
    Observation: Decolourisation of purple KMnO4 solution
  3. Add Br2 in CCl4 in the dark
    Observation: Decolourisation of orange-red bromine solution
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8
Q

State the reaction, reagents, and conditions for:

Preparation of alkenes from alcohols

A

Reaction: Elimination

Reagents and conditions: Excess concentrated H2SO4, heat or Al2O3, heat or excess concentrated H3PO4, heat

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9
Q

State the reaction, reagents, and conditions for:

Preparation of alkenes from halogenoalkanes

A

Reaction: Elimination

Reagents and conditions: Alcoholic KOH/ Alcoholic NaOH, heat

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A Level Organic Chemistry (7 decks)

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