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  4. Which among the following will give a precipitate with ammoniacal silver nitrate?

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Q. Which among the following will give a precipitate with ammoniacal silver nitrate?

CMC MedicalCMC Medical 2008

Solution:

$ {{C}_{2}}{{H}_{2}} $ and all 1-alkynes give white precipitate with ammoniacal silver nitrate, therefore 3-methyl-1-butyne will give a white precipitate with ammoniacal silver nitrate. $ C{{H}_{3}}-\underset{C{{H}_{3}}}{\mathop{\underset{\mathbf{|}}{\mathop{CH}}\,}}\,-C\equiv CH\xrightarrow[AgN{{O}_{3}}]{N{{H}_{4}}OH} $ $ \underset{\text{white}\,\text{ppt}}{\mathop{C{{H}_{3}}-\underset{C{{H}_{3}}}{\mathop{\underset{\mathbf{|}}{\mathop{CH}}\,}}\,-C\equiv CAg\downarrow }}\, $