Q. When and passes through a test tube which have ammoniacal , find out which gas comes out unaffected from test tube?

 1442  201 Bihar CECEBihar CECE 2008 Report Error

Solution:

Copper and silver alkylides are obtained by passing alkynes in the ammoniacal solution of cuprous chloride and silver nitrate respectively. These reactions are used for detecting the presence of acetylenic hydrogen atom.
image
So, alkanes and alkenes remain unaffected.