11 Alkenes

Question 1

CH₃CH₂X → CH₂CH₂ + HX

Answer 1

Elimination:
Ethanolic KOH, heat

Question 2

CH₃CH₂OH → CH₂CH₂ + H₂O

Answer 2

Elimination:
Excess conc. H₂SO₄ / Al₂O₃ / H₃PO₄, heat

Question 3

CH₂CH₂ → CH₃CH₃

Answer 3

Reduction:
H₂, [ Ni, heat / Pt, Pd ]

Question 4

CH₂CH₂ → CH₃CH₂X

Answer 4

Electrophilic addition:
Dry HX(g)

Question 5

CH₂CH₂ → CH₂XCH₂X

Answer 5

Electrophilic addition:
X₂ in CCl₄

Question 6

CH₂CH₂ → CH₂XCH₂OH

Answer 6

Electrophilic addition:
X₂(aq)

Question 7

CH₂CH₂ → CH₃CH₂OH

Answer 7

Electrophilic addition:
Cold conc. H₂SO₄, then H₂O /
H₂O with H₃PO₄ catalyst

Question 8

CH₃CHCH₂ → CH₃COOH + CO₂ + H₂O

Answer 8

Strong oxidation (Acidic):
KMnO₄(aq), H₂SO₄(aq), heat

Question 9

CH₃CHCH₂ → CH₃COO⁻Na⁺ + Na₂CO₃ + H₂O

Answer 9

Strong oxidation (Basic):
KMnO₄(aq), NaOH(aq), heat

Question 10

CH₂CH₂ → CH₂(OH)CH₂OH

Answer 10

Mild oxidation:
KMnO₄(aq), H₂SO₄ / NaOH (aq), cold

Question 11

Reactivity of Alkenes

Answer 11

Generally reactive:
Electron-rich C=C bond attracts electrophiles

Question 12

Reactivity of Alkenes

Answer 12

Generally reactive:
Electron-rich C=C bond attracts electrophiles