Gce Model Questions Vol1 2023 Chemistry Question 50

Practice objective / multiple choice question 50 from the 2023 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2023 Chemistry Objective / Multiple Choice Hard Difficulty
Question 50 GCE_MODEL_QUESTIONS_VOL1 • 2023 • CHEMISTRY • objective

1,2‑Propanediol (\(\mathrm{CH_3CHOHCH_2OH}\)) is oxidised with periodic acid (HIO₄), which cleaves vicinal diols to give aldehydes. The reaction produces acetaldehyde and formaldehyde in a 1 : 1 molar ratio. If 0.050 mol of 1,2‑propanediol is used, calculate: (a) the mass of acetaldehyde and formaldehyde formed. (b) after the aldehydes are reduced with NaBH₄ to the corresponding alcohols (ethanol and methanol), the total mass of the alcohols obtained (assume 100 % yield for each step).

Answer Options

A. Acetaldehyde = 2.20 g; Formaldehyde = 1.80 g; Total alcohol mass = 4.00 g
Correct Answer B. Acetaldehyde = 2.20 g; Formaldehyde = 1.50 g; Total alcohol mass = 3.90 g
C. Acetaldehyde = 2.00 g; Formaldehyde = 1.40 g; Total alcohol mass = 3.40 g
D. Acetaldehyde = 2.50 g; Formaldehyde = 1.50 g; Total alcohol mass = 4.10 g
Correct Answer
B
Correct Option:
Acetaldehyde = 2.20 g; Formaldehyde = 1.50 g; Total alcohol mass = 3.90 g

About This Question

This is Gce Model Questions Vol1 2023 Chemistry Question 50. It is one of the objective questions from the 2023 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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