Chemistry - GOC Question with Solution | TestHub

Question Explanation:

The question asks which option shows the correct order of acidic strength among the given pairs of compounds.

Concept:

Acidic Strength, Inductive Effect, Resonance Effect, Stability of Conjugate Base

Solution:

Acidic strength increases when the conjugate base is stabilized.

Electron-withdrawing groups (–NO₂) increase acidity by –I effect and –R effect, stabilizing the phenoxide ion.

In option (2), the phenol containing three –NO₂ groups is much more acidic than phenol with one –NO₂ group due to stronger electron withdrawal and better charge delocalization.

$HC\equiv CH>C{H}_2=C{H}_2$. sp carbon atom .

$N{H}_3<HC\equiv CH$. sp carbon atom is more electronegative than nitrogen.