Question

How would you draw the product of the hydrogenation of ethyne?

Answer 1

Hint: Alkyne is an unsaturated hydrocarbon which contains at least one carbon-carbon triple bond. The general chemical formula for alkyne is represented as ${{C}_{n}}{{H}_{2n-2}}$. Alkynes are also known by the name acetylenes and in alkyne n=1 is not possible.

Complete answer:
First member of alkyne group is ethyne where n =2 and ethyne is represented by the chemical formula ${{C}_{2}}{{H}_{2}}$and alkyne represents the presence of triple bond between two carbon atoms so ethyne can also be expressed as $CH\equiv CH$.
Hydrogenation is a type of chemical reaction between molecular hydrogen which is represented by ${{H}_{2}}$and any other compound or element in the presence of catalyst and catalyst is that substance which does not take part in the reaction but just increase the rate of reaction. Generally nickel, palladium and platinum are used as catalysts in these reactions. This process is mainly used to reduce saturation in organic compounds. It generally reduces double or triple bonds in hydrocarbons. Hydrogenation has three main components named as unsaturated substrate, hydrogen and catalyst.
Hydrogenation of ethyne can be done by adding hydrogen molecule in the presence of catalyst nickel which can be shown as:
$CH\equiv CH+2{{H}_{2}}\to C{{H}_{3}}-C{{H}_{3}}$
It forms ethane i.e. alkane. Hence we can say that ethane is the product of the hydrogenation of ethyne.

Note:
Catalytic hydrogenation has many industrial applications like in the food industry, petrochemical industry and mainly in organic chemistry for reducing the saturation i.e. presence of double or triple bond between them.