Reactions:

The immense majority of organic reactions occurs at functional groups and is characteristic of that functional group. Though, the reactivity of the functional group is influenced by stereo electronic effects. For instance, a functional group may be surrounded through bulky groups that hinder the reagent's approach and reduce the rate of reaction. This is considered to like steric shielding. Electronic effects can as well affect the rate of a reaction. Neighboring groups can affect the reactivity of a functional group if they are electron-withdrawing or electron- donating and affect the electronic density in the functional group. Conjugation and aromaticity as well has a significant effect on the reactivity of functional groups. For instance, an aromatic ketone reacts at a dissimilar rate from an aliphatic ketone. The aromatic ring is in conjugation along with the carbonyl group and this increases the stability of the complete system, making it less reactive.