Waec Model Questions Vol1 2024 Chemistry Question 33

Practice objective / multiple choice question 33 from the 2024 Waec Model Questions Vol1 Chemistry examination.

Waec Model Questions Vol1 2024 Chemistry Objective / Multiple Choice Hard Difficulty
Question 33 WAEC_MODEL_QUESTIONS_VOL1 • 2024 • CHEMISTRY • objective

A mixture contains 3.7 g of a primary alcohol and 7.4 g of a secondary alcohol. Both alcohols have the same number of carbon atoms. When the mixture is oxidised with Na₂Cr₂O₇/H₂SO₄, the products are 3.6 g of a single aldehyde and 7.2 g of a single ketone. Assuming complete oxidation (primary → aldehyde, secondary → ketone) and no further reactions, determine the molecular formula of the two alcohols and state which one is the primary alcohol.

Answer Options

Correct Answer A. C4H10O; the primary alcohol is the one that gave the aldehyde (butan‑1‑ol) and the secondary alcohol gave the ketone (butan‑2‑ol)
B. C3H8O; the primary alcohol is the one that gave the aldehyde (propan‑1‑ol) and the secondary alcohol gave the ketone (propan‑2‑ol)
C. C5H12O; the primary alcohol is the one that gave the aldehyde (pentan‑1‑ol) and the secondary alcohol gave the ketone (pentan‑2‑ol)
D. C4H10O; the primary alcohol is the one that gave the ketone (butan‑2‑ol) and the secondary alcohol gave the aldehyde (butan‑1‑ol)
Correct Answer
A
Correct Option:
C4H10O; the primary alcohol is the one that gave the aldehyde (butan‑1‑ol) and the secondary alcohol gave the ketone (butan‑2‑ol)

About This Question

This is Waec Model Questions Vol1 2024 Chemistry Question 33. It is one of the objective questions from the 2024 Waec Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

View More Waec Model Questions Vol1 2024 Chemistry Questions More Waec Model Questions Vol1 Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Chat with Support