Question

please help

Question 15 (2 points) Rank the carbonyl compounds in order of increasing acidity. Each carbonyl can form an enolate (1 - weakest acid, largest pka; 3 = strongest acid, lowest pka). Lochs

Answer 1

In (A) - OCHg is as having tM ie positive mesomenic Effect or in some books +R - Effect, which cause the Increase in electron density at Carbong) (Qurbon atom and disturb the conjugation on we can say destablise the ove charge after Removal at labelled Hydrogen to form an el enolate. (muge destalized enolate) In B Hove also instead of -OCHą, a whole Ring is present in the form of alkyl chain which shows +I ( positive inductive Effect) which is less stabligation factor than (+MortR) dike in (A) Hence Yes it will also destablize the eno late in But not more than (A)

MC) open Here, No Election donating group is present which can destablize the anion present. Instead, there is Election withdrawing group present Both side (aebonyl will stablize the ove charge by doing extra conjugation, O te most stable Enolate Ion. Now when we talk about acid, HA Ź Http more stable the anion A more is HA acidic. Hence in this question more stable the enolate mosse bill be the acidic Hydrogen of that carbonyl 4 can easily form enolate Il In (C) Emolate is most stable In (A) Enolate is leest Stable MINUNAVU de oxyo, > > N ocu most acidic moderate least geldic goddele