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JAMB Chemistry 2014 Paper

Question : 34

Total: 45

Ethyne is passed through a hot tube containing organo-nickel catalyst to produce

Solution:

Concept:

Three molecules of ethyne undergo cyclotrimerisation to form benzene.

Explanation:

Ethyne is

\mathrm{C_2H_2}

. When it is passed through a hot tube with an organo-nickel catalyst, three ethyne molecules join into a ring.

The reaction is:

3\mathrm{C_2H_2} \xrightarrow{\text{organo-nickel, heat}} \mathrm{C_6H_6}

The product formed is benzene.

Answer:

D. benzene

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