QCEVault

Organic chemistry — Question 22

QCAA 2021, Paper 1 · 4 marks

Q22 · 2021 · Paper 1Unclassified4 marks

QUESTION 22 (4 marks)

The structural formula for pentane (C5H12) is shown.

Chemistry question figure

Draw the structural formulas for two structural isomers of pentane. Name each isomer.

a) Isomer 1

[2 marks]

Chemistry question figure

Note: If you make a mistake in the drawing, cancel it by ruling a single diagonal line through your work and use the additional response space on page 16 of this question and response book.

IUPAC name:

b) Isomer 2

[2 marks]

Chemistry question figure

Note: If you make a mistake in the drawing, cancel it by ruling a single diagonal line through your work and use the additional response space on page 16 of this question and response book.

IUPAC name:

Question linkQCAA assessment resources

Related questions

  1. Q2 · 2025 QCAA · Paper 1 · 1 mark
    QUESTION 2 Determine the tertiary haloalkane. (A) 2,2-dibromobutane (B) 2,3,3-tribromobutane (C) 2-bromo-2-methylbutane (D) 2-bromo-3-methylbutane
    Organic chemistry
  2. Q4 · 2025 QCAA · Paper 1 · 1 mark
    QUESTION 4 Which type of reaction occurs when an alcohol reacts with a carboxylic acid to form an ester? (A) addition (B) hydrolysis (C) condensation (D) polymerisation
    Organic chemistry
  3. Q12 · 2025 QCAA · Paper 1 · 1 mark
    QUESTION 12 Predict the colour change that occurs when 1-propanol is oxidised to propanoic acid using acidified potassium dichromate (VI). (A) red to yellow (B) orange to green (C) purple to brown (D) pink to colourless
    Organic chemistry
  4. Q24 · 2025 QCAA · Paper 1 · 4 marks
    QUESTION 24  (4 marks) Citronellol is a common ingredient used in the fragrance industry and a component of citronella oil, an insect repellant. Its structure is shown. CH3 CH3 CH3 CH3 CH3 CH3 CH2 CH2 CH2 CH2 CH2 CH2 CH2 CH2 C CH CH CH CH OH OH a) Classify citronellol as saturated or unsaturated. Explain your reasoning. [2 marks] b) Describe a chemical tes…
    Organic chemistry