Neco 2024 Chemistry Question 33

Practice objective / multiple choice question 33 from the 2024 Neco Chemistry examination.

Neco 2024 Chemistry Objective / Multiple Choice Hard Difficulty
Question 33 NECO • 2024 • CHEMISTRY • objective

A 1.00 g sample containing a mixture of a primary alcohol (A) and a secondary alcohol (B), both having the same carbon number, is oxidised with excess acidic potassium dichromate. The oxidation yields 0.45 g of a carboxylic acid (molar mass 88 g·mol\(^{-1}\)) and 0.605 g of a ketone (molar mass 72 g·mol\(^{-1}\)). Assuming complete oxidation of each component, determine the mass of each alcohol present in the original mixture and give the molecular formula of the alcohols.

Answer Options

A. Mass of primary alcohol A ≈ 0.30 g; mass of secondary alcohol B ≈ 0.70 g; molecular formula of each alcohol = C₄H₁₀O
Correct Answer B. Mass of primary alcohol A ≈ 0.38 g; mass of secondary alcohol B ≈ 0.62 g; molecular formula of each alcohol = C₄H₁₀O
C. Mass of primary alcohol A ≈ 0.45 g; mass of secondary alcohol B ≈ 0.55 g; molecular formula of each alcohol = C₄H₁₀O
D. Mass of primary alcohol A ≈ 0.40 g; mass of secondary alcohol B ≈ 0.60 g; molecular formula of each alcohol = C₅H₁₂O
Correct Answer
B
Correct Option:
Mass of primary alcohol A ≈ 0.38 g; mass of secondary alcohol B ≈ 0.62 g; molecular formula of each alcohol = C₄H₁₀O

About This Question

This is Neco 2024 Chemistry Question 33. It is one of the objective questions from the 2024 Neco Chemistry examination.

Difficulty level: Hard .

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