Compounds capable of reacting with ammoniacal AgNO₃ solution are:

• 1) CH₃ - CH(CH₃) - C≡CH
• 2) HC≡CH
• 3) 1 - Butyne
• 4) All the above

To determine which compounds can react with ammoniacal silver nitrate (AgNO3), we need to consider the nature of the compounds listed. Ammoniacal AgNO3 is commonly used to test for terminal alkynes, as they can reduce silver ions to metallic silver, forming a precipitate. Let's analyze each compound you mentioned.

Understanding the Compounds

• 1) CH3-CH(CH3)-C≡CH (2-methyl-1-butyne): This is a terminal alkyne because the triple bond is at the end of the carbon chain. Terminal alkynes can react with ammoniacal AgNO3, producing a silver precipitate.
• 2) HC≡CH (Ethyne or Acetylene): This is the simplest terminal alkyne. It will also react with ammoniacal AgNO3, resulting in the formation of metallic silver.
• 3) 1-Butyne (C≡C-CH2-CH3): Like the previous two, 1-butyne is also a terminal alkyne and will react with ammoniacal AgNO3, yielding a silver precipitate.

Evaluating the Options

Now that we have identified the nature of each compound, we can conclude that all three compounds listed are terminal alkynes. Therefore, they are all capable of reacting with ammoniacal AgNO3. This means that the correct answer to your question is:

All the Above

In summary, since all the compounds you mentioned are terminal alkynes, they will all react with ammoniacal silver nitrate. This reaction is a useful qualitative test in organic chemistry for identifying terminal alkynes, as the formation of a silver mirror or precipitate indicates a positive result.