Question

Draw the major product that is formed when 2-butyne is treated with an excess of hydrogen gas and a platinum catalyst. draw the molecule on the canvas by choosing buttons from the tools (for bonds), atoms, and advanced template toolbars. the single bond is active by default.

Answer 1

Answer:

Addition of hydrogen in unsaturated hydrocarbons is known as Hydrogenation.

Major product that is formed when 2-butyne is treated with an excess of hydrogen gas and a platinum catalyst is an alkane of four carbon atom known as butane.

Here hydrogen gas is in excess, first but-2-ene will form from the but-2-yne then butane will form from the but-2ene.

1) $CH_3-CH\equiv CH-CH_3\overset{H_2/Pt}\rightarrow CH_3-CH=CH-CH_3$

2) $CH_3-CH=CH-CH_3\overset{H_2/Pt}\rightarrow CH_3-CH_2-CH_2-CH_3$

As shown in the image attached.