Unit 1: Organic Chemistry — Unit Test

Assessment OF Learning
Graded — counts toward 70% term mark
Duration: 75 min | Total: /60 marks | Show all work.
K/U
/15
Thinking
/15
Comm.
/15
Applic.
/15
Part A: Knowledge & Understanding [15]
Q1 [3]
IUPAC names: (a) (CH₃)₂CHCH₂CH₃, (b) cis-CH₃CH=CHCH₃, (c) CH₃CH₂COOH.
Q2 [3]
Identify functional group: (a) CH₃CH₂CHO, (b) CH₃COCH₃, (c) CH₃CH₂NH₂.
Q3 [4]
Which is aromatic?
Q4 [5]
Draw and name all three structural isomers of C₅H₁₂.
Part B: Thinking & Investigation [15]
Q5 [5]
Predict the major Markovnikov product: 2-methylpropene + HBr. Explain.
Q6 [5]
Draw and name two structural isomers of C₃H₈O with different functional groups.
Q7 [5]
Write a balanced equation for oxidation of butan-2-ol with acidified K₂Cr₂O₇.
Part C: Communication [15]
Q8 [5]
Compare addition vs condensation polymerization with one example each.
Q9 [5]
Why is ethanol's b.p. (78 °C) much higher than dimethyl ether's (−24 °C), despite same formula C₂H₆O?
Q10 [5]
Define a chiral centre. Provide one chiral example, identifying the chiral C.
Part D: Application [15]
Q11 [5]
Equation for forming ethyl ethanoate (with catalyst).
Q12 [5]
Polyethylene from ethene: write monomer-to-polymer step, describe properties, give one environmental impact and one mitigation.
Q13 [5]
Aspartame contains an ester, a carboxylic acid, an amine, and an amide. Predict stability under acidic stomach conditions.
Complete Answer Key

Q1. (a) 2-methylbutane; (b) cis-2-butene; (c) propanoic acid.

Q2. (a) Aldehyde — propanal; (b) Ketone — propanone; (c) Primary amine — ethanamine.

Q3. Benzene.

Q4. n-pentane; 2-methylbutane; 2,2-dimethylpropane.

Q5. 2-bromo-2-methylpropane (Br on more substituted C; via tertiary carbocation).

Q6. Propan-1-ol (alcohol); methoxyethane (ether).

Q7. 3 CH₃CH(OH)CH₂CH₃ + Cr₂O₇²⁻ + 8H⁺ → 3 CH₃COCH₂CH₃ + 2 Cr³⁺ + 7 H₂O. Product: butan-2-one.

Q8. Addition: alkene → polyethylene (no by-product). Condensation: diol+diacid → polyester (releases H₂O).

Q9. Ethanol H-bonds via O–H; dimethyl ether cannot. H-bonding raises b.p.

Q10. C bonded to 4 different groups. Butan-2-ol's C2.

Q11. CH₃COOH + C₂H₅OH ⇌(H₂SO₄) CH₃COOC₂H₅ + H₂O.

Q12. n CH₂=CH₂ → –(CH₂CH₂)n–. Flexible, durable, low density. Persistent waste; mitigate via recycling and bioplastics.

Q13. Ester likely hydrolyzes first under H⁺/H₂O; amide more stable but slowly hydrolyzed; carboxylic acid protonated; amine protonated.