WAEC Chemistry 2019 Objective — Question 30
Question 30 of 50 from the West African Examinations Council (WAEC) Chemistry 2019 Objective paper, with the correct answer and a full explanation.
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Which of the following reagents could be used to distinguish between propan-1-ol and propan-2-ol?
- A. H+/K2Cr2O7
- B. I2/NaOHCorrect
- C. CH3COOH
- D. NaOH
Explanation
Propan-2-ol (a secondary alcohol) gives a positive iodoform test with I2/NaOH (yellow precipitate), while propan-1-ol does not, since iodoform reaction requires a CH3CH(OH)- structure.
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