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CGPET 2012 Solved Paper

Section: Chemistry

Question : 89 of 150

Marks: +1, -0

Solution:

Propyne because of the presence of acidic

\mathrm{H}

-atom, reacts with ammoniacal

\mathrm{AgNO}_3

and gives grey/white silver propynilide. Propene, on the other hand, does not have any acidic H-atom, so it does not react with ammoniacal

\mathrm{AgNO}_3

. Hence, these two are separated by this reagent.

\mathrm{CH}_3\mathrm{C}\equiv\equiv\mathrm{CH}+\mathrm{AgNO}_3+\mathrm{NH}_4\mathrm{OH}\longrightarrow

\underset{\text{silver propynilide}}{\mathrm{CH}_3\mathrm{C}\equiv\mathrm{CAg}} \downarrow + \mathrm{NH}_4\mathrm{NO}_3 + \mathrm{H}_2\mathrm{O}

\mathrm{CH}_3\mathrm{CH}=\mathrm{CH}_2+\mathrm{AgNO}_3+\mathrm{NH}_4\mathrm{OH}

\longrightarrow

No reaction

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