Gce Model Questions Vol1 2018 Chemistry Question 39

Practice objective / multiple choice question 39 from the 2018 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2018 Chemistry Objective / Multiple Choice Hard Difficulty
Question 39 GCE_MODEL_QUESTIONS_VOL1 • 2018 • CHEMISTRY • objective

A 10.0 g sample of an unknown primary alcohol (A) is mixed with a 5.0 g sample of an unknown secondary alcohol (B). The mixture is oxidised with excess acidified potassium dichromate. After the reaction, 13.5 g of a carboxylic acid and 4.8 g of a ketone are isolated. Assuming complete oxidation (primary alcohol → carboxylic acid, secondary alcohol → ketone) and no side reactions, determine the molar masses of A and B.

Answer Options

A. M_A ≈ 48 g mol⁻¹, M_B = 52 g mol⁻¹
B. M_A ≈ 50 g mol⁻¹, M_B = 46 g mol⁻¹
Correct Answer C. M_A ≈ 46 g mol⁻¹, M_B = 50 g mol⁻¹
D. M_A ≈ 44 g mol⁻¹, M_B = 48 g mol⁻¹
Correct Answer
C
Correct Option:
M_A ≈ 46 g mol⁻¹, M_B = 50 g mol⁻¹

About This Question

This is Gce Model Questions Vol1 2018 Chemistry Question 39. It is one of the objective questions from the 2018 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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