Waec Model Questions Vol1 2017 Chemistry Question 4

Practice objective / multiple choice question 4 from the 2017 Waec Model Questions Vol1 Chemistry examination.

Waec Model Questions Vol1 2017 Chemistry Objective / Multiple Choice Hard Difficulty
Question 4 WAEC_MODEL_QUESTIONS_VOL1 • 2017 • CHEMISTRY • objective

1.20 g of a secondary alcohol having molecular formula C₅H₁₂O is reacted with excess acetic anhydride, (CH₃CO)₂O, to give its acetate ester. The ester is then completely hydrolysed, and the amount of acetic acid formed is determined by titration with 0.100 M NaOH, requiring 12.5 mL of the NaOH solution to reach the endpoint. Assuming 100 % yield for both the esterification and the hydrolysis steps, (i) calculate the percentage of the original alcohol that actually reacted, and (ii) list all possible structural isomers of a secondary alcohol with formula C₅H₁₂O. Give the percentage to one decimal place.

Answer Options

A. 3.9; 2‑Pentanol, 3‑Pentanol, 2‑Methyl‑2‑butanol
B. 5.2; 2‑Pentanol, 3‑Pentanol, 2‑Methyl‑1‑butanol, 3‑Methyl‑2‑butanol
C. 6.1; 1‑Pentanol, 2‑Pentanol, 3‑Pentanol, 2‑Methyl‑2‑butanol, 3‑Methyl‑2‑butanol
Correct Answer D. 4.6; 2‑Pentanol, 3‑Pentanol, 2‑Methyl‑2‑butanol, 3‑Methyl‑2‑butanol
Correct Answer
D
Correct Option:
4.6; 2‑Pentanol, 3‑Pentanol, 2‑Methyl‑2‑butanol, 3‑Methyl‑2‑butanol

About This Question

This is Waec Model Questions Vol1 2017 Chemistry Question 4. It is one of the objective questions from the 2017 Waec Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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