Which of the following alkynes react with sodium in liquid ammonia?

The hydrocarbon which can react with sodium in liquid ammonia is. Alkynes on reduction with sodium in liquid NH3 form trans alkene.

What happens when sodium is added to liquid ammonia?

Sodium metal when dissolved in liquid ammonia forms a blue coloured solution.

Why terminal alkynes Cannot reduced by Na in liquid ammonia?

The reduction of terminal alkynes with sodium in liquid ammonia does not proceed as efficiently as the reduction of internal alkynes. This is because terminal alkynes have acidic protons that readily react with the sodium–liquid ammonia mixture to form sodium acetylide.

Does NA NH3 reduce alkenes?

Alkynes + Na + NH3. This reaction is stereospecific giving only the trans-alkene via an anti addition. These reaction conditions do not reduce alkenes, hence the product is the alkene.

Which alkyne does not react with Na?

Acetylene is acidic but it does not react with sodium hydroxide or potassium hydroxide.

Why solution become good conductor when sodium is added in liquid ammonia?

When sodium metal is added to ammonia, some of the sodium dissolves. Each of the dissolving sodium atoms loses an electron and becomes a cation. The solvated electrons give the blue color to the solution. Because of the mobility of the electrons, the solution is a good electrical conductor.

Why sodium dissolved in liquid ammonia form blue solution explain its nature?

For alkali metals in liquid ammonia, the solution is blue when dilute and copper-colored when more concentrated (> 3 molar). These solutions conduct electricity. The blue colour of the solution is due to ammoniated electrons, which absorb energy in the visible region of light.

Can Terminal alkynes be reduced?

The reaction shown is a metal-ammonia reduction of a terminal alkyne. This reduction will turn an alkyne into its corresponding trans alkene (however, since this alkyne is terminal, there is no cis/trans stereochemistry around the resulting alkene).

How can alkyne be reduced to alkenes?

Alkynes can be reduced to trans-alkenes with the use of sodium dissolved in an ammonia solvent. An Na radical donates an electron to one of the P bonds in a carbon-carbon triple bond. This forms an anion, which can be protonated by a hydrogen in an ammonia solvent.

What does oso4 do in a reaction?

In organic synthesis OsO4 is widely used to oxidize alkenes to the vicinal diols, adding two hydroxyl groups at the same side (syn addition). See reaction and mechanism above. This reaction has been made both catalytic (Upjohn dihydroxylation) and asymmetric (Sharpless asymmetric dihydroxylation).