Birch Reduction: Birch reduction involves the controlled reduction of alkynes and atomic compounds in the presence of alkali metals and alcohol. It provides a method to stereospecifically prepare alkenes of                      E-configuration
$\mathrm{R}-\mathrm{C}\equiv \mathrm{C}-\mathrm{R}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\underrightarrow{\mathrm{M},\mathrm{EOH}}$
The characteristic type of reaction of alkyne is electrophilic addition reaction like alkenes. The alkynes show various reactions such as halogenation, hydration, hydrogenation etc 0.405g of a sample of hydrocarbon occupies 229.54ml at 100⁰C and 1 atm pressure. It decolorizes KMnO₄ and Br₂ water. When it reacts with dil.H₂SO₄ under appropriate conditions, methylethyl ketone is formed.