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JAMB Chemistry 2019 Paper

Question : 6

Total: 80

Hydrocarbons which will react with Tollen's reagent conform to the general formula

C $_n$ H $_{2n}$
C $_n$ H $_{2n + 2}$
C $_n$ H $_{2n - 2}$
C $_n$ H $_{2n + 1}$ OH

Validate

Solution:

Concept:

Hydrocarbons that react with Tollen’s reagent are terminal alkynes, which have the general formula

\mathrm{C}_n\mathrm{H}_{2n-2}

Explanation:

Tollen’s reagent gives a positive test with terminal alkynes, such as acetylene, because the hydrogen atom on a terminal triple bond is acidic enough to form silver acetylide precipitate.

Terminal alkynes are acyclic hydrocarbons with one triple bond.

Their general molecular formula is:

\mathrm{C}_n\mathrm{H}_{2n-2}

Answer:

\mathrm{C}_n\mathrm{H}_{2n-2}

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