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Select the keyword or phrase that will best complete each sentence. The tautomer has a C=O and an additional C-H bond. In comparing two enolates, the one with more substituents around the C=C double bond is lower in energy and is called the enolate. When a base is added to a carbonyl without an electronegative atom (as with aldehydes and ketones), an enolate is formed. This enolate undergoes nucleophilic The formation of an enolate is an acid-base equilibrium, so the thebase, the more enolate that forms. A enolate is formed with a strong, nonnucleophilic base in a polar aprotic solvent at low temperatures. Nucleophilic occurs when there is an electronegative atom on the carbonyl carbon (as with carboxylic acids and their derivatives) The tautomer has an O-H group bonded to a C=C. Enolates are formed when a proton on the a carbon to a carbonyl group. In comparing two enolates, the one that is formed more rapidly is called the enolate.