JAMB Chemistry 2019 Objective — Question 35

Question 35 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2019 Objective paper, with the correct answer and a full explanation.

The preparation of ethoxyethane (C₂H₅OC₂H₅) from ethanol can be considered as

A. dehydrationCorrect
B. oxidation
C. hydrolysis
D. dehydrogenation

Explanation

When excess alkanol is subjected to partial dehydration with concentrated H₂SO₄ at about 145°C, two moles of the alkanol jointly lose a mole of water to form an ether: 2C₂H₅OH →(−H₂O, conc. H₂SO₄, 145°C)→ C₂H₅OC₂H₅. This is a dehydration reaction.

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