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

Difficulty level: Hard .

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