Question

Compounds capable of reacting with ammoniacal $AgN{O_3}$ solution are
1) $C{H_3} - CH(C{H_3}) - C \equiv CH$
2) $HC \equiv CH$
3) ${\text{1 - }}$Butyne
4) All the above

Answer 1

Hint: The reagent ammoniacal $AgN{O_3}$ solution is called Tollens reagent. One can analyze the given compounds in the options and react with an ammoniacal $AgN{O_3}$ solution and see which can give a positive result for Tollens reagent.

Complete step by step answer:
1) First of all we will learn about the reagent given in the question which is an ammoniacal $AgN{O_3}$ solution. The ammoniacal $AgN{O_3}$ solution is also called the Tollens reagent and this reagent is used for the identification of specific functional groups in a molecule.
2) The Tollens reagent gives a positive test only for the structure which has terminal alkynes present in it. The terminal alkyne means the carbon-carbon triple bond which is present between the carbon no one and two in a structure.
3) Now let's analyze the given structures and see which structures have the terminal alkyne present in its structure. The 1st structure $C{H_3} - CH(C{H_3}) - C \equiv CH$ has the alkyne at the 1st carbon hence, it shows the positive result for Tollen’s reagent.
4) The 2nd structure $HC \equiv CH$ has an alkyne functional group which is terminal. Hence, this also gives a positive test for reagent ammoniacal $AgN{O_3}$ solution.
5) The 3rd structure ${\text{1 - }}$Butyne has an alkyne group present in it at the 1st carbon which is also the terminal position. Hence, this structure also gives a positive test for reagent ammoniacal $AgN{O_3}$ solution.
6) Therefore, the compounds given in all three options are capable of reacting with an ammoniacal $AgN{O_3}$ solution that is all of the above which shows option D as the correct choice.

So, the correct answer is Option D.

Note: When the terminal alkynes are reacted with a reagent ammoniacal $AgN{O_3}$ solution that is Tollens reagent, it produces precipitate in the reaction solution as the product. As the Tollens reagent has $AgN{O_3}$ as its composition it is used for silver mirroring to glassware products.