Hello i need help to understand on how to rank acidity of compounds

[Henri_1234]

For example i have this exercise that something like that will be on my exam, i just want to understand it, from where and how to begin ranking idk why but it seems so hard to me 

[chenbeier]

Acid group COOH high acidic, followed by ketogroups, ester and alcohol

[Henri_1234]

2 minutes ago, chenbeier said:

Acid group COOH high acidic, followed by ketogroups, ester and alcohol

im a beginner on organic chemistry, can you tell me which of these are the ketogroups and ester groups?

[chenbeier]

R-CO-R' Keto, RCOOR' Ester

But I suggestion to get a book of organic chemistry or use the WEB. Acidic will be the H close to them.

The CH2 between the two Keto groups in c will be acidic

Edited January 4 by chenbeier

[Henri_1234]

7 minutes ago, chenbeier said:

R-CO-R' Keto, RCOOR' Ester

But I suggestions to get a book of organic chemistry or use the WEB.

ok and which is more acidic B OR C ?

Edited January 4 by Henri_1234

[chenbeier]

C is more acidic, why is it so. Check - I and / or - M Effect.

[exchemist]

1 hour ago, Henri_1234 said:

ok and which is more acidic B OR C ?

The groups which tend to be the most electron-withdrawing will make it easier for H+ to be released ( more stable anion).  A carbonyl C=O can spend some time as C⁺-O⁻. So the CH2 between 2 carbonyls gets the effect from both sides, making it easier for one of the Hs to come off, leaving an enolate anion, cf. keto-enol tautomerism: https://chem.libretexts.org/Bookshelves/Organic_Chemistry/Organic_Chemistry_(Morsch_et_al.)/22%3A_Carbonyl_Alpha-Substitution_Reactions/22.01%3A_Keto-Enol_Tautomerism. 

You can apply the same logic to A vs. F.

If you have an exam coming, you must have some revision notes or lecture material on this kind of thing. 

Edited January 4 by exchemist