Rank the following compounds from most reactive to least reactive toward nucleophilic addition:

Nucleophilic addition is a fundamental reaction in organic chemistry where a nucleophile attacks an electrophilic center, typically a carbon atom in a carbonyl group. This reaction is crucial for forming new carbon-carbon or carbon-heteroatom bonds. The reactivity of compounds toward nucleophilic addition depends on the electrophilicity of the carbonyl carbon, which is influenced by factors such as steric hindrance and electronic effects.

Electrophilicity refers to the tendency of a chemical species to accept electrons, making it a target for nucleophiles. In the context of carbonyl compounds, the more positive the carbonyl carbon is, the more reactive it is toward nucleophilic attack. Factors that enhance electrophilicity include the presence of electron-withdrawing groups and the overall stability of the molecule, which can affect the carbonyl's susceptibility to nucleophiles.

Steric hindrance is the prevention of chemical reactions due to the spatial arrangement of atoms within a molecule. In nucleophilic addition reactions, bulky substituents around the electrophilic center can impede the approach of nucleophiles, thereby decreasing reactivity. Understanding steric effects is essential for predicting the reactivity of various carbonyl compounds, as more sterically hindered compounds are generally less reactive toward nucleophilic addition.