Question

rank the following acids from least acidic to most acidic

Question List (5 images) (Drag and drop into the appropriate area) ОН з , , ОН ОН ОН Rr

Answer 1

First we apply Bronsted-Lowry acid base theory and according to which an acid is a proton donar, while a base is a proton acceptor. Also, after donating a proton an acid forms conjugate base and a base after gaining a proton forms conjugate acid. Since the structures given in the question are acidic in nature, so we make the conjugate base as shown below.

ملتی

Higher the stability of conjugate base, higher is the acidity of the acid.

All the four structures are same except the group present at the marked position shown in figure.

So, here the stability of the conjugate base can be compared by the inductive effect. Higher is the –I effect, higher is the stability of the conjugate base and higher is the acidity. Here the trend of –I effect is F>Cl >Br, this trend is on the basis of electronegativity of F, Cl, and Br, higher is the electronegativity, higher is the –I effect. And in the last structure, there is no –I but +I effect by CH3 so it is least acidic in nature.

Hence the acidic trend is shown below.

plocha Least acidic Mout audic Audity increasing