Question

Which of the following compound will not give a
precipitate with Tollen's reagent
(1) ethyne
(2) 1-butyne
(3) 3-methyl-1-butyne (4) 1-pentene​

Answer 1

Answer:

I think Pentene

all 3 option have so carbon

@ 1-pentene has sp^2 Carbon

it is not so reactive

Answer 2

(3) 3-methyl-1-butyne and (4) 1-pentene​. Both 3-methyl-1-butene and 1-pentene will not give a precipitate with Tollen's reagent.

Explanation:

Both 3-methyl-1-butene and 1-pentene will not give a precipitate with Tollen's reagent.

An alkaline solution of ammoniacal silver nitrate is known as Tollen's reagent.

The following are tested with it: aldehyde, hydroxy ketone, terminal alkyne. With the aforementioned solutions, it forms a white precipitate when tested.

However, when tested with 1-pentene and 3-methyl-1-butene, it does not produce a white precipitate. Both 3-methyl-1-butene and 1-pentene contain neither a terminal alkyne nor an aldehyde group as well as a hydroxy ketone.

As a result, when tested with the tollen's reagent, it will not precipitate. Tollen's reagent will precipitate silver alkynes when mixed with a terminal alkyne.

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