Problem 20 - Entrance Test

A) Alkanes are saturated hydrocarbons containing only strong C-C and C-H single bonds. These bonds are nonpolar and stable, making alkanes relatively unreactive. They primarily undergo substitution reactions under harsh conditions (e.g., UV light for halogenation) and combustion. B) Alkenes contain a C=C double bond, which is a site of high electron density and is reactive towards addition reactions. C) Alkynes contain a C≡C triple bond, which is even more reactive than double bonds towards addition reactions. D) Aromatic hydrocarbons (like benzene) have a stable delocalized pi-electron system, which makes them less prone to addition reactions than typical alkenes, but they readily undergo electrophilic substitution reactions. Among the options, alkanes are generally considered the least reactive.