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JAMB Chemistry 2012 Paper

Question : 44

Total: 45

Solution:

Concept:

Concentrated tetraoxosulphate (VI) acid dehydrates ethanol at high temperature to form an alkene.

Explanation:

At temperatures above

170^\circ\mathrm{C}

, ethanol undergoes dehydration.

The reaction removes a water molecule from ethanol:

\mathrm{C_2H_5OH} \xrightarrow{\mathrm{conc.\ H_2SO_4,\ >170^\circ C} } \mathrm{CH_2=CH_2} + \mathrm{H_2O}

The product formed is ethene, an alkene with the formula

\mathrm{C_2H_4}

Answer:

B. ethene

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