Propene, also known as propylene or methyl ethylene, is an unsaturated organic compound having the chemical formula . It has one double bond, and is the second simplest member of the alkene class of hydrocarbons.

The addition of dihydrogen to propyne is a type of hydrogenation reaction, where the double bond in propyne is broken and replaced with two hydrogen atoms. This leads to the formation of a new compound, propene.

Explanation:

Propyne has the chemical formula C3H4, containing a triple bond between the second and third carbon atoms. When dihydrogen (H2) is added to propyne, it reacts with the triple bond and leads to the formation of a new compound, propene (C3H6). The reaction can be represented by the following chemical equation:

C3H4 + H2 → C3H6

This reaction is an example of an addition reaction, where the reactants combine to form a single product. The addition of dihydrogen to propyne breaks the triple bond between the carbon atoms and forms a single bond between them. The remaining carbon-carbon double bond in propene is more stable than the triple bond in propyne, making it a more favorable product.

Option (C) is the correct answer, as propene is the product formed when dihydrogen is added to propyne.

In summary, the addition of dihydrogen to propyne leads to the formation of propene, where the triple bond in propyne is broken and replaced with a carbon-carbon double bond.

Break 1πbond and add 2H....cis addition(reagent not mentioned) so..