Identify the carbonyl that would react more quickly with a nucleophile.

Determine whether the below-given species is a strong, intermediate, or weak nucleophile. Would this nucleophile add directly to a carbonyl or wait for the carbocation formation before adding to the carbonyl?

Nucleophilic addition can occur at carbon 2 or carbon 4 of the given α,β-unsaturated ketone. Explain why.

Identify from the given set of carbonyls, under basic conditions, which will react fastest and the slowest toward nucleophilic addition.