Waec Model Questions Vol1 2025 Chemistry Question 40
Practice objective / multiple choice question 40 from the 2025 Waec Model Questions Vol1 Chemistry examination.
A student carries out the following sequence starting from 2‑butanol (CH₃‑CH(OH)‑CH₂‑CH₃): (i) oxidation with PCC to give butan‑2‑one (85 % yield); (ii) reaction with phenylhydrazine to form the corresponding phenylhydrazone (90 % yield); (iii) Wolff-Kishner reduction of the phenylhydrazone with NaNH₂ to give butane (80 % yield). Calculate (a) the overall percent yield for the three‑step synthesis and (b) the mass of butane obtained when 10.0 g of 2‑butanol is used.
Answer Options
About This Question
This is Waec Model Questions Vol1 2025 Chemistry Question 40. It is one of the objective questions from the 2025 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
Master the Exam!
You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.