Which of the following compounds will undergo additional reaction?

Explanation

Ethyne is the correct answer because it can undergo an addition reaction. Addition reactions are chemical reactions where one or more atoms are added to a molecule. These reactions often involve unsaturated compounds, which have double or triple bonds.

Ethyne, also known as acetylene, has the molecular formula C₂H₂. Its structure contains a triple bond between the two carbon atoms, making it an unsaturated compound. The presence of this triple bond allows ethyne to undergo addition reactions, such as hydrogenation, where hydrogen atoms are added across the triple bond, converting it to a double bond or a single bond depending on the reaction conditions.

In contrast, butane, pentane, and tetrachloromethane are saturated compounds, meaning they have only single bonds between their atoms. Saturated compounds generally do not undergo addition reactions. Ethanol, on the other hand, has an -OH group, which makes it an alcohol. While alcohols can participate in some addition reactions, they are generally less reactive than unsaturated compounds like ethyne.

In summary, ethyne is the compound that will undergo addition reactions due to its unsaturated nature and the presence of a triple bond between its carbon atoms.